Luis Castelo-Branco, Elif Uygur Kucukseymen, Dante Duarte, Mirret M El-Hagrassy, Camila Bonin Pinto, Muhammed Enes Gunduz, Alejandra Cardenas-Rojas, Kevin Pacheco-Barrios, Yiling Yang, Paola Gonzalez-Mego, Anayali Estudillo-Guerra, Ludmilla Candido-Santos, Ines Mesia-Toledo, Haley Rafferty, Wolnei Caumo, Felipe Fregni. BMJ Open 2019
Times Cited: 14
Times Cited: 14
Times Cited
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Evidence-based guidelines on the therapeutic use of transcranial direct current stimulation (tDCS).
Jean-Pascal Lefaucheur, Andrea Antal, Samar S Ayache, David H Benninger, Jérôme Brunelin, Filippo Cogiamanian, Maria Cotelli, Dirk De Ridder, Roberta Ferrucci, Berthold Langguth,[...]. Clin Neurophysiol 2017
Jean-Pascal Lefaucheur, Andrea Antal, Samar S Ayache, David H Benninger, Jérôme Brunelin, Filippo Cogiamanian, Maria Cotelli, Dirk De Ridder, Roberta Ferrucci, Berthold Langguth,[...]. Clin Neurophysiol 2017
35
Efficacy of transcranial direct current stimulation coupled with a multidisciplinary rehabilitation program for the treatment of fibromyalgia.
Marcelo Riberto, Fabio Marcon Alfieri, Kátia Monteiro de Benedetto Pacheco, Valeria Dini Leite, Harumi Nemoto Kaihami, Felipe Fregni, Linamara Rizzo Battistella. Open Rheumatol J 2011
Marcelo Riberto, Fabio Marcon Alfieri, Kátia Monteiro de Benedetto Pacheco, Valeria Dini Leite, Harumi Nemoto Kaihami, Felipe Fregni, Linamara Rizzo Battistella. Open Rheumatol J 2011
28
Transcranial Direct Current Stimulation Combined with Aerobic Exercise to Optimize Analgesic Responses in Fibromyalgia: A Randomized Placebo-Controlled Clinical Trial.
Mariana E Mendonca, Marcel Simis, Luanda C Grecco, Linamara R Battistella, Abrahão F Baptista, Felipe Fregni. Front Hum Neurosci 2016
Mariana E Mendonca, Marcel Simis, Luanda C Grecco, Linamara R Battistella, Abrahão F Baptista, Felipe Fregni. Front Hum Neurosci 2016
28
A sham-controlled, phase II trial of transcranial direct current stimulation for the treatment of central pain in traumatic spinal cord injury.
Felipe Fregni, Paulo S Boggio, Moises C Lima, Merari J L Ferreira, Tim Wagner, Sergio P Rigonatti, Anita W Castro, Daniel R Souza, Marcelo Riberto, Steven D Freedman,[...]. Pain 2006
Felipe Fregni, Paulo S Boggio, Moises C Lima, Merari J L Ferreira, Tim Wagner, Sergio P Rigonatti, Anita W Castro, Daniel R Souza, Marcelo Riberto, Steven D Freedman,[...]. Pain 2006
28
Transcranial Direct Current Stimulation as a Therapeutic Tool for Chronic Pain.
Camila Bonin Pinto, Beatriz Teixeira Costa, Dante Duarte, Felipe Fregni. J ECT 2018
Camila Bonin Pinto, Beatriz Teixeira Costa, Dante Duarte, Felipe Fregni. J ECT 2018
28
Clinical research with transcranial direct current stimulation (tDCS): challenges and future directions.
Andre Russowsky Brunoni, Michael A Nitsche, Nadia Bolognini, Marom Bikson, Tim Wagner, Lotfi Merabet, Dylan J Edwards, Antoni Valero-Cabre, Alexander Rotenberg, Alvaro Pascual-Leone,[...]. Brain Stimul 2012
Andre Russowsky Brunoni, Michael A Nitsche, Nadia Bolognini, Marom Bikson, Tim Wagner, Lotfi Merabet, Dylan J Edwards, Antoni Valero-Cabre, Alexander Rotenberg, Alvaro Pascual-Leone,[...]. Brain Stimul 2012
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Pain facilitation and pain inhibition during conditioned pain modulation in fibromyalgia and in healthy controls.
Stéphane Potvin, Serge Marchand. Pain 2016
Stéphane Potvin, Serge Marchand. Pain 2016
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Central sensitization in fibromyalgia? A systematic review on structural and functional brain MRI.
Barbara Cagnie, Iris Coppieters, Sien Denecker, Jasmien Six, Lieven Danneels, Mira Meeus. Semin Arthritis Rheum 2014
Barbara Cagnie, Iris Coppieters, Sien Denecker, Jasmien Six, Lieven Danneels, Mira Meeus. Semin Arthritis Rheum 2014
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Efficacy of anodal transcranial direct current stimulation (tDCS) for the treatment of fibromyalgia: results of a randomized, sham-controlled longitudinal clinical trial.
Angela Valle, Suely Roizenblatt, Sueli Botte, Soroush Zaghi, Marcelo Riberto, Sergio Tufik, Paulo S Boggio, Felipe Fregni. J Pain Manag 2009
Angela Valle, Suely Roizenblatt, Sueli Botte, Soroush Zaghi, Marcelo Riberto, Sergio Tufik, Paulo S Boggio, Felipe Fregni. J Pain Manag 2009
21
Effects of transcranial direct current stimulation on pain, mood and serum endorphin level in the treatment of fibromyalgia: A double blinded, randomized clinical trial.
Eman M Khedr, Eman A H Omran, Nadia M Ismail, Dina H El-Hammady, Samar H Goma, Hassan Kotb, Hannan Galal, Ayman M Osman, Hannan S M Farghaly, Ahmed A Karim,[...]. Brain Stimul 2017
Eman M Khedr, Eman A H Omran, Nadia M Ismail, Dina H El-Hammady, Samar H Goma, Hassan Kotb, Hannan Galal, Ayman M Osman, Hannan S M Farghaly, Ahmed A Karim,[...]. Brain Stimul 2017
21
Transcranial direct current stimulation as a treatment for patients with fibromyalgia: a randomized controlled trial.
Asbjørn J Fagerlund, Odd A Hansen, Per M Aslaksen. Pain 2015
Asbjørn J Fagerlund, Odd A Hansen, Per M Aslaksen. Pain 2015
21
High-Definition Transcranial Direct Current Stimulation Enhances Conditioned Pain Modulation in Healthy Volunteers: A Randomized Trial.
Andrew Flood, Gordon Waddington, Stuart Cathcart. J Pain 2016
Andrew Flood, Gordon Waddington, Stuart Cathcart. J Pain 2016
21
Large Treatment Effect With Extended Home-Based Transcranial Direct Current Stimulation Over Dorsolateral Prefrontal Cortex in Fibromyalgia: A Proof of Concept Sham-Randomized Clinical Study.
Aline P Brietzke, Maxciel Zortea, Fabiana Carvalho, Paulo R S Sanches, Danton P Jr Silva, Iraci Lucena da Silva Torres, Felipe Fregni, Wolnei Caumo. J Pain 2020
Aline P Brietzke, Maxciel Zortea, Fabiana Carvalho, Paulo R S Sanches, Danton P Jr Silva, Iraci Lucena da Silva Torres, Felipe Fregni, Wolnei Caumo. J Pain 2020
21
Focal modulation of the primary motor cortex in fibromyalgia using 4×1-ring high-definition transcranial direct current stimulation (HD-tDCS): immediate and delayed analgesic effects of cathodal and anodal stimulation.
Mauricio F Villamar, Pakorn Wivatvongvana, Jayanton Patumanond, Marom Bikson, Dennis Q Truong, Abhishek Datta, Felipe Fregni. J Pain 2013
Mauricio F Villamar, Pakorn Wivatvongvana, Jayanton Patumanond, Marom Bikson, Dennis Q Truong, Abhishek Datta, Felipe Fregni. J Pain 2013
21
A randomized, sham-controlled, proof of principle study of transcranial direct current stimulation for the treatment of pain in fibromyalgia.
Felipe Fregni, Rafaela Gimenes, Angela C Valle, Merari J L Ferreira, Renata R Rocha, Luane Natalle, Riviane Bravo, Sergio P Rigonatti, Steven D Freedman, Michael A Nitsche,[...]. Arthritis Rheum 2006
Felipe Fregni, Rafaela Gimenes, Angela C Valle, Merari J L Ferreira, Renata R Rocha, Luane Natalle, Riviane Bravo, Sergio P Rigonatti, Steven D Freedman, Michael A Nitsche,[...]. Arthritis Rheum 2006
21
Differential effects of bifrontal and occipital nerve stimulation on pain and fatigue using transcranial direct current stimulation in fibromyalgia patients.
Wing Ting To, Evan James, Jan Ost, John Hart, Dirk De Ridder, Sven Vanneste. J Neural Transm (Vienna) 2017
Wing Ting To, Evan James, Jan Ost, John Hart, Dirk De Ridder, Sven Vanneste. J Neural Transm (Vienna) 2017
21
Brain Modulation by Electric Currents in Fibromyalgia: A Structured Review on Non-invasive Approach With Transcranial Electrical Stimulation.
Filippo Brighina, Massimiliano Curatolo, Giuseppe Cosentino, Marina De Tommaso, Giuseppe Battaglia, Pier Carlo Sarzi-Puttini, Giuliana Guggino, Brigida Fierro. Front Hum Neurosci 2019
Filippo Brighina, Massimiliano Curatolo, Giuseppe Cosentino, Marina De Tommaso, Giuseppe Battaglia, Pier Carlo Sarzi-Puttini, Giuliana Guggino, Brigida Fierro. Front Hum Neurosci 2019
21
Is Transcranial Direct Current Stimulation (tDCS) Effective for the Treatment of Pain in Fibromyalgia? A Systematic Review and Meta-Analysis.
Donna M Lloyd, Priscilla G Wittkopf, Laura J Arendsen, Anthony K P Jones. J Pain 2020
Donna M Lloyd, Priscilla G Wittkopf, Laura J Arendsen, Anthony K P Jones. J Pain 2020
21
Decreased neural inhibitory state in fibromyalgia pain: A cross-sectional study.
Elif Uygur-Kucukseymen, Luis Castelo-Branco, Kevin Pacheco-Barrios, Maria Alejandra Luna-Cuadros, Alejandra Cardenas-Rojas, Stefano Giannoni-Luza, Huiyan Zeng, Anna Carolyna Gianlorenco, Marina Gnoatto-Medeiros, Emad Salman Shaikh,[...]. Neurophysiol Clin 2020
Elif Uygur-Kucukseymen, Luis Castelo-Branco, Kevin Pacheco-Barrios, Maria Alejandra Luna-Cuadros, Alejandra Cardenas-Rojas, Stefano Giannoni-Luza, Huiyan Zeng, Anna Carolyna Gianlorenco, Marina Gnoatto-Medeiros, Emad Salman Shaikh,[...]. Neurophysiol Clin 2020
25
The effects of transcranial direct current stimulation (tDCS) combined with group exercise treatment in subjects with chronic low back pain: a pilot randomized control trial.
Sofia Straudi, Sergio Buja, Andrea Baroni, Claudia Pavarelli, Giulia Pranovi, Felipe Fregni, Nino Basaglia. Clin Rehabil 2018
Sofia Straudi, Sergio Buja, Andrea Baroni, Claudia Pavarelli, Giulia Pranovi, Felipe Fregni, Nino Basaglia. Clin Rehabil 2018
14
Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement.
David Moher, Alessandro Liberati, Jennifer Tetzlaff, Douglas G Altman. PLoS Med 2009
David Moher, Alessandro Liberati, Jennifer Tetzlaff, Douglas G Altman. PLoS Med 2009
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Electrical stimulation of motor cortex for pain control: a combined PET-scan and electrophysiological study.
L García-Larrea, R Peyron, P Mertens, M C Gregoire, F Lavenne, D Le Bars, P Convers, F Mauguière, M Sindou, B Laurent. Pain 1999
L García-Larrea, R Peyron, P Mertens, M C Gregoire, F Lavenne, D Le Bars, P Convers, F Mauguière, M Sindou, B Laurent. Pain 1999
14
Positron emission tomography during motor cortex stimulation for pain control.
L García-Larrea, R Peyron, P Mertens, M C Grégoire, F Lavenne, F Bonnefoi, F Mauguière, B Laurent, M Sindou. Stereotact Funct Neurosurg 1997
L García-Larrea, R Peyron, P Mertens, M C Grégoire, F Lavenne, F Bonnefoi, F Mauguière, B Laurent, M Sindou. Stereotact Funct Neurosurg 1997
14
The Contribution of Endogenous Modulatory Systems to TMS- and tDCS-Induced Analgesia: Evidence from PET Studies.
Marcos F DosSantos, Aleli T Oliveira, Natália R Ferreira, Antônio C P Carvalho, Paulo Henrique Rosado de Castro. Pain Res Manag 2018
Marcos F DosSantos, Aleli T Oliveira, Natália R Ferreira, Antônio C P Carvalho, Paulo Henrique Rosado de Castro. Pain Res Manag 2018
14
A technical guide to tDCS, and related non-invasive brain stimulation tools.
A J Woods, A Antal, M Bikson, P S Boggio, A R Brunoni, P Celnik, L G Cohen, F Fregni, C S Herrmann, E S Kappenman,[...]. Clin Neurophysiol 2016
A J Woods, A Antal, M Bikson, P S Boggio, A R Brunoni, P Celnik, L G Cohen, F Fregni, C S Herrmann, E S Kappenman,[...]. Clin Neurophysiol 2016
14
Pain reduction in myofascial pain syndrome by anodal transcranial direct current stimulation combined with standard treatment: a randomized controlled study.
Piyaraid Sakrajai, Taweesak Janyacharoen, Mark P Jensen, Kittisak Sawanyawisuth, Narong Auvichayapat, Orathai Tunkamnerdthai, Keattichai Keeratitanont, Paradee Auvichayapat. Clin J Pain 2014
Piyaraid Sakrajai, Taweesak Janyacharoen, Mark P Jensen, Kittisak Sawanyawisuth, Narong Auvichayapat, Orathai Tunkamnerdthai, Keattichai Keeratitanont, Paradee Auvichayapat. Clin J Pain 2014
14
Addition of transcranial direct current stimulation to quadriceps strengthening exercise in knee osteoarthritis: A pilot randomised controlled trial.
Wei-Ju Chang, Kim L Bennell, Paul W Hodges, Rana S Hinman, Carolyn L Young, Valentina Buscemi, Matthew B Liston, Siobhan M Schabrun. PLoS One 2017
Wei-Ju Chang, Kim L Bennell, Paul W Hodges, Rana S Hinman, Carolyn L Young, Valentina Buscemi, Matthew B Liston, Siobhan M Schabrun. PLoS One 2017
14
The American College of Rheumatology 1990 Criteria for the Classification of Fibromyalgia. Report of the Multicenter Criteria Committee.
F Wolfe, H A Smythe, M B Yunus, R M Bennett, C Bombardier, D L Goldenberg, P Tugwell, S M Campbell, M Abeles, P Clark. Arthritis Rheum 1990
F Wolfe, H A Smythe, M B Yunus, R M Bennett, C Bombardier, D L Goldenberg, P Tugwell, S M Campbell, M Abeles, P Clark. Arthritis Rheum 1990
14
EEGLAB: an open source toolbox for analysis of single-trial EEG dynamics including independent component analysis.
Arnaud Delorme, Scott Makeig. J Neurosci Methods 2004
Arnaud Delorme, Scott Makeig. J Neurosci Methods 2004
14
Increased EEG power and slowed dominant frequency in patients with neurogenic pain.
Johannes Sarnthein, Jair Stern, Christoph Aufenberg, Valentin Rousson, Daniel Jeanmonod. Brain 2006
Johannes Sarnthein, Jair Stern, Christoph Aufenberg, Valentin Rousson, Daniel Jeanmonod. Brain 2006
14
Alteration of cortical excitability in patients with fibromyalgia.
Alaa Mhalla, Daniel Ciampi de Andrade, Sophie Baudic, Serge Perrot, Didier Bouhassira. Pain 2010
Alaa Mhalla, Daniel Ciampi de Andrade, Sophie Baudic, Serge Perrot, Didier Bouhassira. Pain 2010
14
Motor Cortex Excitability and BDNF Levels in Chronic Musculoskeletal Pain According to Structural Pathology.
Wolnei Caumo, Alícia Deitos, Sandra Carvalho, Jorge Leite, Fabiana Carvalho, Jairo Alberto Dussán-Sarria, Maria da Graça Lopes Tarragó, Andressa Souza, Iraci Lucena da Silva Torres, Felipe Fregni. Front Hum Neurosci 2016
Wolnei Caumo, Alícia Deitos, Sandra Carvalho, Jorge Leite, Fabiana Carvalho, Jairo Alberto Dussán-Sarria, Maria da Graça Lopes Tarragó, Andressa Souza, Iraci Lucena da Silva Torres, Felipe Fregni. Front Hum Neurosci 2016
14
Excitability changes induced in the human motor cortex by weak transcranial direct current stimulation.
M A Nitsche, W Paulus. J Physiol 2000
M A Nitsche, W Paulus. J Physiol 2000
14
Transcranial direct current stimulation for upper limb neuropathic pain: A double-blind randomized controlled trial.
G N Lewis, D A Rice, M Kluger, P J McNair. Eur J Pain 2018
G N Lewis, D A Rice, M Kluger, P J McNair. Eur J Pain 2018
16
Differential effects of cathodal transcranial direct current stimulation of prefrontal, motor and somatosensory cortices on cortical excitability and pain perception - a double-blind randomised sham-controlled study.
B Vaseghi, M Zoghi, S Jaberzadeh. Eur J Neurosci 2015
B Vaseghi, M Zoghi, S Jaberzadeh. Eur J Neurosci 2015
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Corticospinal excitability as a biomarker of myofascial pain syndrome.
Aurore Thibaut, Dian Zeng, Wolnei Caumo, Jianhua Liu, Felipe Fregni. Pain Rep 2017
Aurore Thibaut, Dian Zeng, Wolnei Caumo, Jianhua Liu, Felipe Fregni. Pain Rep 2017
16
Putative physiological mechanisms underlying tDCS analgesic effects.
Helena Knotkova, Michael A Nitsche, Ricardo A Cruciani. Front Hum Neurosci 2013
Helena Knotkova, Michael A Nitsche, Ricardo A Cruciani. Front Hum Neurosci 2013
14
How does transcranial DC stimulation of the primary motor cortex alter regional neuronal activity in the human brain?
Nicolas Lang, Hartwig R Siebner, Nick S Ward, Lucy Lee, Michael A Nitsche, Walter Paulus, John C Rothwell, Roger N Lemon, Richard S Frackowiak. Eur J Neurosci 2005
Nicolas Lang, Hartwig R Siebner, Nick S Ward, Lucy Lee, Michael A Nitsche, Walter Paulus, John C Rothwell, Roger N Lemon, Richard S Frackowiak. Eur J Neurosci 2005
14
Cathodal and anodal left prefrontal tDCS and the perception of control over pain.
Jennifer C Naylor, Jeffery J Borckardt, Christine E Marx, Robert M Hamer, Sarah Fredrich, Scott T Reeves, Mark S George. Clin J Pain 2014
Jennifer C Naylor, Jeffery J Borckardt, Christine E Marx, Robert M Hamer, Sarah Fredrich, Scott T Reeves, Mark S George. Clin J Pain 2014
14
Pharmacological modulation of cortical excitability shifts induced by transcranial direct current stimulation in humans.
M A Nitsche, K Fricke, U Henschke, A Schlitterlau, D Liebetanz, N Lang, S Henning, F Tergau, W Paulus. J Physiol 2003
M A Nitsche, K Fricke, U Henschke, A Schlitterlau, D Liebetanz, N Lang, S Henning, F Tergau, W Paulus. J Physiol 2003
14
Clinically Effective Treatment of Fibromyalgia Pain With High-Definition Transcranial Direct Current Stimulation: Phase II Open-Label Dose Optimization.
Laura Castillo-Saavedra, Nigel Gebodh, Marom Bikson, Camilo Diaz-Cruz, Rivail Brandao, Livia Coutinho, Dennis Truong, Abhishek Datta, Revital Shani-Hershkovich, Michal Weiss,[...]. J Pain 2016
Laura Castillo-Saavedra, Nigel Gebodh, Marom Bikson, Camilo Diaz-Cruz, Rivail Brandao, Livia Coutinho, Dennis Truong, Abhishek Datta, Revital Shani-Hershkovich, Michal Weiss,[...]. J Pain 2016
14
Transcranial DC stimulation in fibromyalgia: optimized cortical target supported by high-resolution computational models.
Mariana E Mendonca, Marcus B Santana, Abrahão F Baptista, Abhishek Datta, Marom Bikson, Felipe Fregni, Cintia P Araujo. J Pain 2011
Mariana E Mendonca, Marcus B Santana, Abrahão F Baptista, Abhishek Datta, Marom Bikson, Felipe Fregni, Cintia P Araujo. J Pain 2011
14
Pharmacological approach to the mechanisms of transcranial DC-stimulation-induced after-effects of human motor cortex excitability.
David Liebetanz, Michael A Nitsche, Frithjof Tergau, Walter Paulus. Brain 2002
David Liebetanz, Michael A Nitsche, Frithjof Tergau, Walter Paulus. Brain 2002
14
Transcranial direct current stimulation to lessen neuropathic pain after spinal cord injury: a mechanistic PET study.
Eun Jin Yoon, Yu Kyeong Kim, Hye-Ri Kim, Sang Eun Kim, Youngjo Lee, Hyung Ik Shin. Neurorehabil Neural Repair 2014
Eun Jin Yoon, Yu Kyeong Kim, Hye-Ri Kim, Sang Eun Kim, Youngjo Lee, Hyung Ik Shin. Neurorehabil Neural Repair 2014
14
Longitudinal Clinical Trial Recruitment and Retention Challenges in the Burn Population: Lessons Learned From a Trial Examining a Novel Intervention for Chronic Neuropathic Symptoms.
Emily A Ohrtman, Ana Luiza Zaninotto, Sandra Carvalho, Vivian L Shie, Jorge Leite, Corinne Rose Ianni, Lewis E Kazis, Ross Zafonte, Colleen M Ryan, Jeffrey C Schneider,[...]. J Burn Care Res 2019
Emily A Ohrtman, Ana Luiza Zaninotto, Sandra Carvalho, Vivian L Shie, Jorge Leite, Corinne Rose Ianni, Lewis E Kazis, Ross Zafonte, Colleen M Ryan, Jeffrey C Schneider,[...]. J Burn Care Res 2019
40
A systematic review on reporting and assessment of adverse effects associated with transcranial direct current stimulation.
Andre Russowsky Brunoni, Joao Amadera, Bruna Berbel, Magdalena Sarah Volz, Brenno Gomes Rizzerio, Felipe Fregni. Int J Neuropsychopharmacol 2011
Andre Russowsky Brunoni, Joao Amadera, Bruna Berbel, Magdalena Sarah Volz, Brenno Gomes Rizzerio, Felipe Fregni. Int J Neuropsychopharmacol 2011
14
Effects of motor cortex modulation and descending inhibitory systems on pain thresholds in healthy subjects.
Jay S Reidler, Mariana E Mendonca, Marcus B Santana, Xiaoen Wang, Robert Lenkinski, Andrea F Motta, Serge Marchand, Lydia Latif, Felipe Fregni. J Pain 2012
Jay S Reidler, Mariana E Mendonca, Marcus B Santana, Xiaoen Wang, Robert Lenkinski, Andrea F Motta, Serge Marchand, Lydia Latif, Felipe Fregni. J Pain 2012
14
Transcranial direct current stimulation (tDCS) and its influence on analgesics effectiveness in patients suffering from migraine headache.
Anna Przeklasa-Muszyńska, Magdalena Kocot-Kępska, Jan Dobrogowski, Maciej Wiatr, Joanna Mika. Pharmacol Rep 2017
Anna Przeklasa-Muszyńska, Magdalena Kocot-Kępska, Jan Dobrogowski, Maciej Wiatr, Joanna Mika. Pharmacol Rep 2017
14
tDCS-induced analgesia and electrical fields in pain-related neural networks in chronic migraine.
Alexandre F Dasilva, Mariana E Mendonca, Soroush Zaghi, Mariana Lopes, Marcos Fabio Dossantos, Egilius L Spierings, Zahid Bajwa, Abhishek Datta, Marom Bikson, Felipe Fregni. Headache 2012
Alexandre F Dasilva, Mariana E Mendonca, Soroush Zaghi, Mariana Lopes, Marcos Fabio Dossantos, Egilius L Spierings, Zahid Bajwa, Abhishek Datta, Marom Bikson, Felipe Fregni. Headache 2012
14
Co-cited is the co-citation frequency, indicating how many articles cite the article together with the query article. Similarity is the co-citation as percentage of the times cited of the query article or the article in the search results, whichever is the lowest. These numbers are calculated for the last 100 citations when articles are cited more than 100 times.