The prevalence of depression, anxiety, and sleep disturbances in COVID-19 patients: a meta-analysis.
Jiawen Deng, Fangwen Zhou, Wenteng Hou, Zachary Silver, Chi Yi Wong, Oswin Chang, Emma Huang, Qi Kang Zuo. Ann N Y Acad Sci 2021
Times Cited: 128
Times Cited: 128
Times Cited
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Psychiatric and neuropsychiatric presentations associated with severe coronavirus infections: a systematic review and meta-analysis with comparison to the COVID-19 pandemic.
Jonathan P Rogers, Edward Chesney, Dominic Oliver, Thomas A Pollak, Philip McGuire, Paolo Fusar-Poli, Michael S Zandi, Glyn Lewis, Anthony S David. Lancet Psychiatry 2020
Jonathan P Rogers, Edward Chesney, Dominic Oliver, Thomas A Pollak, Philip McGuire, Paolo Fusar-Poli, Michael S Zandi, Glyn Lewis, Anthony S David. Lancet Psychiatry 2020
21
Prevalence of stress, anxiety, depression among the general population during the COVID-19 pandemic: a systematic review and meta-analysis.
Nader Salari, Amin Hosseinian-Far, Rostam Jalali, Aliakbar Vaisi-Raygani, Shna Rasoulpoor, Masoud Mohammadi, Shabnam Rasoulpoor, Behnam Khaledi-Paveh. Global Health 2020
Nader Salari, Amin Hosseinian-Far, Rostam Jalali, Aliakbar Vaisi-Raygani, Shna Rasoulpoor, Masoud Mohammadi, Shabnam Rasoulpoor, Behnam Khaledi-Paveh. Global Health 2020
19
Anxiety and depression in COVID-19 survivors: Role of inflammatory and clinical predictors.
Mario Gennaro Mazza, Rebecca De Lorenzo, Caterina Conte, Sara Poletti, Benedetta Vai, Irene Bollettini, Elisa Maria Teresa Melloni, Roberto Furlan, Fabio Ciceri, Patrizia Rovere-Querini,[...]. Brain Behav Immun 2020
Mario Gennaro Mazza, Rebecca De Lorenzo, Caterina Conte, Sara Poletti, Benedetta Vai, Irene Bollettini, Elisa Maria Teresa Melloni, Roberto Furlan, Fabio Ciceri, Patrizia Rovere-Querini,[...]. Brain Behav Immun 2020
15
Prevalence of depression, anxiety, and insomnia among healthcare workers during the COVID-19 pandemic: A systematic review and meta-analysis.
Sofia Pappa, Vasiliki Ntella, Timoleon Giannakas, Vassilis G Giannakoulis, Eleni Papoutsi, Paraskevi Katsaounou. Brain Behav Immun 2020
Sofia Pappa, Vasiliki Ntella, Timoleon Giannakas, Vassilis G Giannakoulis, Eleni Papoutsi, Paraskevi Katsaounou. Brain Behav Immun 2020
15
Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China.
Chaolin Huang, Yeming Wang, Xingwang Li, Lili Ren, Jianping Zhao, Yi Hu, Li Zhang, Guohui Fan, Jiuyang Xu, Xiaoying Gu,[...]. Lancet 2020
Chaolin Huang, Yeming Wang, Xingwang Li, Lili Ren, Jianping Zhao, Yi Hu, Li Zhang, Guohui Fan, Jiuyang Xu, Xiaoying Gu,[...]. Lancet 2020
14
The psychological impact of quarantine and how to reduce it: rapid review of the evidence.
Samantha K Brooks, Rebecca K Webster, Louise E Smith, Lisa Woodland, Simon Wessely, Neil Greenberg, Gideon James Rubin. Lancet 2020
Samantha K Brooks, Rebecca K Webster, Louise E Smith, Lisa Woodland, Simon Wessely, Neil Greenberg, Gideon James Rubin. Lancet 2020
13
Multidisciplinary research priorities for the COVID-19 pandemic: a call for action for mental health science.
Emily A Holmes, Rory C O'Connor, V Hugh Perry, Irene Tracey, Simon Wessely, Louise Arseneault, Clive Ballard, Helen Christensen, Roxane Cohen Silver, Ian Everall,[...]. Lancet Psychiatry 2020
Emily A Holmes, Rory C O'Connor, V Hugh Perry, Irene Tracey, Simon Wessely, Louise Arseneault, Clive Ballard, Helen Christensen, Roxane Cohen Silver, Ian Everall,[...]. Lancet Psychiatry 2020
13
6-month consequences of COVID-19 in patients discharged from hospital: a cohort study.
Chaolin Huang, Lixue Huang, Yeming Wang, Xia Li, Lili Ren, Xiaoying Gu, Liang Kang, Li Guo, Min Liu, Xing Zhou,[...]. Lancet 2021
Chaolin Huang, Lixue Huang, Yeming Wang, Xia Li, Lili Ren, Xiaoying Gu, Liang Kang, Li Guo, Min Liu, Xing Zhou,[...]. Lancet 2021
12
Sleep problems during the COVID-19 pandemic by population: a systematic review and meta-analysis.
Haitham Jahrami, Ahmed S BaHammam, Nicola Luigi Bragazzi, Zahra Saif, MoezAlIslam Faris, Michael V Vitiello. J Clin Sleep Med 2021
Haitham Jahrami, Ahmed S BaHammam, Nicola Luigi Bragazzi, Zahra Saif, MoezAlIslam Faris, Michael V Vitiello. J Clin Sleep Med 2021
12
The Pittsburgh Sleep Quality Index: a new instrument for psychiatric practice and research.
D J Buysse, C F Reynolds, T H Monk, S R Berman, D J Kupfer. Psychiatry Res 1989
D J Buysse, C F Reynolds, T H Monk, S R Berman, D J Kupfer. Psychiatry Res 1989
11
The PHQ-9: validity of a brief depression severity measure.
K Kroenke, R L Spitzer, J B Williams. J Gen Intern Med 2001
K Kroenke, R L Spitzer, J B Williams. J Gen Intern Med 2001
11
Immediate psychological distress in quarantined patients with COVID-19 and its association with peripheral inflammation: A mixed-method study.
Qian Guo, Yuchen Zheng, Jia Shi, Jijun Wang, Guanjun Li, Chunbo Li, John A Fromson, Yong Xu, Xiaohua Liu, Hua Xu,[...]. Brain Behav Immun 2020
Qian Guo, Yuchen Zheng, Jia Shi, Jijun Wang, Guanjun Li, Chunbo Li, John A Fromson, Yong Xu, Xiaohua Liu, Hua Xu,[...]. Brain Behav Immun 2020
10
Immediate Psychological Responses and Associated Factors during the Initial Stage of the 2019 Coronavirus Disease (COVID-19) Epidemic among the General Population in China.
Cuiyan Wang, Riyu Pan, Xiaoyang Wan, Yilin Tan, Linkang Xu, Cyrus S Ho, Roger C Ho. Int J Environ Res Public Health 2020
Cuiyan Wang, Riyu Pan, Xiaoyang Wan, Yilin Tan, Linkang Xu, Cyrus S Ho, Roger C Ho. Int J Environ Res Public Health 2020
10
A brief measure for assessing generalized anxiety disorder: the GAD-7.
Robert L Spitzer, Kurt Kroenke, Janet B W Williams, Bernd Löwe. Arch Intern Med 2006
Robert L Spitzer, Kurt Kroenke, Janet B W Williams, Bernd Löwe. Arch Intern Med 2006
10
Generalized anxiety disorder, depressive symptoms and sleep quality during COVID-19 outbreak in China: a web-based cross-sectional survey.
Yeen Huang, Ning Zhao. Psychiatry Res 2020
Yeen Huang, Ning Zhao. Psychiatry Res 2020
10
Neurologic Manifestations of Hospitalized Patients With Coronavirus Disease 2019 in Wuhan, China.
Ling Mao, Huijuan Jin, Mengdie Wang, Yu Hu, Shengcai Chen, Quanwei He, Jiang Chang, Candong Hong, Yifan Zhou, David Wang,[...]. JAMA Neurol 2020
Ling Mao, Huijuan Jin, Mengdie Wang, Yu Hu, Shengcai Chen, Quanwei He, Jiang Chang, Candong Hong, Yifan Zhou, David Wang,[...]. JAMA Neurol 2020
9
Neurological and neuropsychiatric complications of COVID-19 in 153 patients: a UK-wide surveillance study.
Aravinthan Varatharaj, Naomi Thomas, Mark A Ellul, Nicholas W S Davies, Thomas A Pollak, Elizabeth L Tenorio, Mustafa Sultan, Ava Easton, Gerome Breen, Michael Zandi,[...]. Lancet Psychiatry 2020
Aravinthan Varatharaj, Naomi Thomas, Mark A Ellul, Nicholas W S Davies, Thomas A Pollak, Elizabeth L Tenorio, Mustafa Sultan, Ava Easton, Gerome Breen, Michael Zandi,[...]. Lancet Psychiatry 2020
9
Factors Associated With Mental Health Outcomes Among Health Care Workers Exposed to Coronavirus Disease 2019.
Jianbo Lai, Simeng Ma, Ying Wang, Zhongxiang Cai, Jianbo Hu, Ning Wei, Jiang Wu, Hui Du, Tingting Chen, Ruiting Li,[...]. JAMA Netw Open 2020
Jianbo Lai, Simeng Ma, Ying Wang, Zhongxiang Cai, Jianbo Hu, Ning Wei, Jiang Wu, Hui Du, Tingting Chen, Ruiting Li,[...]. JAMA Netw Open 2020
9
Impact of COVID-19 pandemic on mental health in the general population: A systematic review.
Jiaqi Xiong, Orly Lipsitz, Flora Nasri, Leanna M W Lui, Hartej Gill, Lee Phan, David Chen-Li, Michelle Iacobucci, Roger Ho, Amna Majeed,[...]. J Affect Disord 2020
Jiaqi Xiong, Orly Lipsitz, Flora Nasri, Leanna M W Lui, Hartej Gill, Lee Phan, David Chen-Li, Michelle Iacobucci, Roger Ho, Amna Majeed,[...]. J Affect Disord 2020
9
6-month neurological and psychiatric outcomes in 236 379 survivors of COVID-19: a retrospective cohort study using electronic health records.
Maxime Taquet, John R Geddes, Masud Husain, Sierra Luciano, Paul J Harrison. Lancet Psychiatry 2021
Maxime Taquet, John R Geddes, Masud Husain, Sierra Luciano, Paul J Harrison. Lancet Psychiatry 2021
9
Bidirectional associations between COVID-19 and psychiatric disorder: retrospective cohort studies of 62 354 COVID-19 cases in the USA.
Maxime Taquet, Sierra Luciano, John R Geddes, Paul J Harrison. Lancet Psychiatry 2021
Maxime Taquet, Sierra Luciano, John R Geddes, Paul J Harrison. Lancet Psychiatry 2021
8
Posttraumatic stress symptoms and attitude toward crisis mental health services among clinically stable patients with COVID-19 in China.
Hai-Xin Bo, Wen Li, Yuan Yang, Yu Wang, Qinge Zhang, Teris Cheung, Xinjuan Wu, Yu-Tao Xiang. Psychol Med 2021
Hai-Xin Bo, Wen Li, Yuan Yang, Yu Wang, Qinge Zhang, Teris Cheung, Xinjuan Wu, Yu-Tao Xiang. Psychol Med 2021
8
Prevalence of psychological morbidities among general population, healthcare workers and COVID-19 patients amidst the COVID-19 pandemic: A systematic review and meta-analysis.
Yuvaraj Krishnamoorthy, Ramya Nagarajan, Ganesh Kumar Saya, Vikas Menon. Psychiatry Res 2020
Yuvaraj Krishnamoorthy, Ramya Nagarajan, Ganesh Kumar Saya, Vikas Menon. Psychiatry Res 2020
8
Changes in sleep pattern, sense of time and digital media use during COVID-19 lockdown in Italy.
Nicola Cellini, Natale Canale, Giovanna Mioni, Sebastiano Costa. J Sleep Res 2020
Nicola Cellini, Natale Canale, Giovanna Mioni, Sebastiano Costa. J Sleep Res 2020
8
Timely mental health care for the 2019 novel coronavirus outbreak is urgently needed.
Yu-Tao Xiang, Yuan Yang, Wen Li, Ling Zhang, Qinge Zhang, Teris Cheung, Chee H Ng. Lancet Psychiatry 2020
Yu-Tao Xiang, Yuan Yang, Wen Li, Ling Zhang, Qinge Zhang, Teris Cheung, Chee H Ng. Lancet Psychiatry 2020
7
The psychological and mental impact of coronavirus disease 2019 (COVID-19) on medical staff and general public - A systematic review and meta-analysis.
Min Luo, Lixia Guo, Mingzhou Yu, Wenying Jiang, Haiyan Wang. Psychiatry Res 2020
Min Luo, Lixia Guo, Mingzhou Yu, Wenying Jiang, Haiyan Wang. Psychiatry Res 2020
7
A longitudinal study on the mental health of general population during the COVID-19 epidemic in China.
Cuiyan Wang, Riyu Pan, Xiaoyang Wan, Yilin Tan, Linkang Xu, Roger S McIntyre, Faith N Choo, Bach Tran, Roger Ho, Vijay K Sharma,[...]. Brain Behav Immun 2020
Cuiyan Wang, Riyu Pan, Xiaoyang Wan, Yilin Tan, Linkang Xu, Roger S McIntyre, Faith N Choo, Bach Tran, Roger Ho, Vijay K Sharma,[...]. Brain Behav Immun 2020
7
Psychometric evaluation of the Pittsburgh Sleep Quality Index.
J S Carpenter, M A Andrykowski. J Psychosom Res 1998
J S Carpenter, M A Andrykowski. J Psychosom Res 1998
7
Prevalence of depression during the COVID-19 outbreak: A meta-analysis of community-based studies.
Juan Bueno-Notivol, Patricia Gracia-García, Beatriz Olaya, Isabel Lasheras, Raúl López-Antón, Javier Santabárbara. Int J Clin Health Psychol 2021
Juan Bueno-Notivol, Patricia Gracia-García, Beatriz Olaya, Isabel Lasheras, Raúl López-Antón, Javier Santabárbara. Int J Clin Health Psychol 2021
7
Dealing with sleep problems during home confinement due to the COVID-19 outbreak: Practical recommendations from a task force of the European CBT-I Academy.
Ellemarije Altena, Chiara Baglioni, Colin A Espie, Jason Ellis, Dimitri Gavriloff, Brigitte Holzinger, Angelika Schlarb, Lukas Frase, Susanna Jernelöv, Dieter Riemann. J Sleep Res 2020
Ellemarije Altena, Chiara Baglioni, Colin A Espie, Jason Ellis, Dimitri Gavriloff, Brigitte Holzinger, Angelika Schlarb, Lukas Frase, Susanna Jernelöv, Dieter Riemann. J Sleep Res 2020
7
The relationship between resilience, anxiety and depression among patients with mild symptoms of COVID-19 in China: A cross-sectional study.
Jie Zhang, Zhen Yang, Xiao Wang, Juan Li, Lili Dong, Fusheng Wang, Yifei Li, Ruihong Wei, Jingping Zhang. J Clin Nurs 2020
Jie Zhang, Zhen Yang, Xiao Wang, Juan Li, Lili Dong, Fusheng Wang, Yifei Li, Ruihong Wei, Jingping Zhang. J Clin Nurs 2020
13
Post-discharge persistent symptoms and health-related quality of life after hospitalization for COVID-19.
Eve Garrigues, Paul Janvier, Yousra Kherabi, Audrey Le Bot, Antoine Hamon, Hélène Gouze, Lucile Doucet, Sabryne Berkani, Emma Oliosi, Elise Mallart,[...]. J Infect 2020
Eve Garrigues, Paul Janvier, Yousra Kherabi, Audrey Le Bot, Antoine Hamon, Hélène Gouze, Lucile Doucet, Sabryne Berkani, Emma Oliosi, Elise Mallart,[...]. J Infect 2020
6
Prevalence of depression and its association with quality of life in clinically stable patients with COVID-19.
Yu-Fen Ma, Wen Li, Hai-Bao Deng, Lei Wang, Ying Wang, Pei-Hong Wang, Hai-Xin Bo, Jing Cao, Yu Wang, Li-Yun Zhu,[...]. J Affect Disord 2020
Yu-Fen Ma, Wen Li, Hai-Bao Deng, Lei Wang, Ying Wang, Pei-Hong Wang, Hai-Xin Bo, Jing Cao, Yu Wang, Li-Yun Zhu,[...]. J Affect Disord 2020
9
Anxiety and depression and its correlates in patients with coronavirus disease 2019 in Wuhan.
Xue-Dan Nie, Qin Wang, Min-Nan Wang, Shuai Zhao, Lei Liu, Yu-Lan Zhu, Hong Chen. Int J Psychiatry Clin Pract 2021
Xue-Dan Nie, Qin Wang, Min-Nan Wang, Shuai Zhao, Lei Liu, Yu-Lan Zhu, Hong Chen. Int J Psychiatry Clin Pract 2021
23
A Nationwide Survey of Psychological Distress among Italian People during the COVID-19 Pandemic: Immediate Psychological Responses and Associated Factors.
Cristina Mazza, Eleonora Ricci, Silvia Biondi, Marco Colasanti, Stefano Ferracuti, Christian Napoli, Paolo Roma. Int J Environ Res Public Health 2020
Cristina Mazza, Eleonora Ricci, Silvia Biondi, Marco Colasanti, Stefano Ferracuti, Christian Napoli, Paolo Roma. Int J Environ Res Public Health 2020
6
The Fear of COVID-19 Scale: Development and Initial Validation.
Daniel Kwasi Ahorsu, Chung-Ying Lin, Vida Imani, Mohsen Saffari, Mark D Griffiths, Amir H Pakpour. Int J Ment Health Addict 2020
Daniel Kwasi Ahorsu, Chung-Ying Lin, Vida Imani, Mohsen Saffari, Mark D Griffiths, Amir H Pakpour. Int J Ment Health Addict 2020
6
Neurological associations of COVID-19.
Mark A Ellul, Laura Benjamin, Bhagteshwar Singh, Suzannah Lant, Benedict Daniel Michael, Ava Easton, Rachel Kneen, Sylviane Defres, Jim Sejvar, Tom Solomon. Lancet Neurol 2020
Mark A Ellul, Laura Benjamin, Bhagteshwar Singh, Suzannah Lant, Benedict Daniel Michael, Ava Easton, Rachel Kneen, Sylviane Defres, Jim Sejvar, Tom Solomon. Lancet Neurol 2020
6
Measuring inconsistency in meta-analyses.
Julian P T Higgins, Simon G Thompson, Jonathan J Deeks, Douglas G Altman. BMJ 2003
Julian P T Higgins, Simon G Thompson, Jonathan J Deeks, Douglas G Altman. BMJ 2003
6
COVID-19 pandemic and mental health consequences: Systematic review of the current evidence.
Nina Vindegaard, Michael Eriksen Benros. Brain Behav Immun 2020
Nina Vindegaard, Michael Eriksen Benros. Brain Behav Immun 2020
6
Insomnia during the COVID-19 pandemic in a Greek population.
Panteleimon Voitsidis, Ioannis Gliatas, Vasiliki Bairachtari, Kalliopi Papadopoulou, Georgios Papageorgiou, Eleni Parlapani, Markos Syngelakis, Vasiliki Holeva, Ioannis Diakogiannis. Psychiatry Res 2020
Panteleimon Voitsidis, Ioannis Gliatas, Vasiliki Bairachtari, Kalliopi Papadopoulou, Georgios Papageorgiou, Eleni Parlapani, Markos Syngelakis, Vasiliki Holeva, Ioannis Diakogiannis. Psychiatry Res 2020
6
The differential psychological distress of populations affected by the COVID-19 pandemic.
Jie Zhang, Huipeng Lu, Haiping Zeng, Shining Zhang, Qifeng Du, Tingyun Jiang, Baoguo Du. Brain Behav Immun 2020
Jie Zhang, Huipeng Lu, Haiping Zeng, Shining Zhang, Qifeng Du, Tingyun Jiang, Baoguo Du. Brain Behav Immun 2020
6
Corrigendum to Generalized anxiety disorder, depressive symptoms and sleep quality during COVID-19 outbreak in China: a web-based cross-sectional survey [Psychiatry Research, 288 (2020) 112954].
Yeen Huang, Ning Zhao. Psychiatry Res 2021
Yeen Huang, Ning Zhao. Psychiatry Res 2021
6
Post-acute COVID-19 syndrome.
Ani Nalbandian, Kartik Sehgal, Aakriti Gupta, Mahesh V Madhavan, Claire McGroder, Jacob S Stevens, Joshua R Cook, Anna S Nordvig, Daniel Shalev, Tejasav S Sehrawat,[...]. Nat Med 2021
Ani Nalbandian, Kartik Sehgal, Aakriti Gupta, Mahesh V Madhavan, Claire McGroder, Jacob S Stevens, Joshua R Cook, Anna S Nordvig, Daniel Shalev, Tejasav S Sehrawat,[...]. Nat Med 2021
6
Neuropathogenesis and Neurologic Manifestations of the Coronaviruses in the Age of Coronavirus Disease 2019: A Review.
Adeel S Zubair, Lindsay S McAlpine, Tova Gardin, Shelli Farhadian, Deena E Kuruvilla, Serena Spudich. JAMA Neurol 2020
Adeel S Zubair, Lindsay S McAlpine, Tova Gardin, Shelli Farhadian, Deena E Kuruvilla, Serena Spudich. JAMA Neurol 2020
5
The enemy who sealed the world: effects quarantine due to the COVID-19 on sleep quality, anxiety, and psychological distress in the Italian population.
Maria Casagrande, Francesca Favieri, Renata Tambelli, Giuseppe Forte. Sleep Med 2020
Maria Casagrande, Francesca Favieri, Renata Tambelli, Giuseppe Forte. Sleep Med 2020
5
Postdischarge symptoms and rehabilitation needs in survivors of COVID-19 infection: A cross-sectional evaluation.
Stephen J Halpin, Claire McIvor, Gemma Whyatt, Anastasia Adams, Olivia Harvey, Lyndsay McLean, Christopher Walshaw, Steven Kemp, Joanna Corrado, Rajinder Singh,[...]. J Med Virol 2021
Stephen J Halpin, Claire McIvor, Gemma Whyatt, Anastasia Adams, Olivia Harvey, Lyndsay McLean, Christopher Walshaw, Steven Kemp, Joanna Corrado, Rajinder Singh,[...]. J Med Virol 2021
5
Delirium in Older Patients With COVID-19 Presenting to the Emergency Department.
Maura Kennedy, Benjamin K I Helfand, Ray Yun Gou, Sarah L Gartaganis, Margaret Webb, J Michelle Moccia, Stacey N Bruursema, Belinda Dokic, Brigid McCulloch, Hope Ring,[...]. JAMA Netw Open 2020
Maura Kennedy, Benjamin K I Helfand, Ray Yun Gou, Sarah L Gartaganis, Margaret Webb, J Michelle Moccia, Stacey N Bruursema, Belinda Dokic, Brigid McCulloch, Hope Ring,[...]. JAMA Netw Open 2020
6
Clinical Characteristics of 138 Hospitalized Patients With 2019 Novel Coronavirus-Infected Pneumonia in Wuhan, China.
Dawei Wang, Bo Hu, Chang Hu, Fangfang Zhu, Xing Liu, Jing Zhang, Binbin Wang, Hui Xiang, Zhenshun Cheng, Yong Xiong,[...]. JAMA 2020
Dawei Wang, Bo Hu, Chang Hu, Fangfang Zhu, Xing Liu, Jing Zhang, Binbin Wang, Hui Xiang, Zhenshun Cheng, Yong Xiong,[...]. JAMA 2020
5
Incidence of Post-Traumatic Stress Disorder After Coronavirus Disease.
Min Cheol Chang, Donghwi Park. Healthcare (Basel) 2020
Min Cheol Chang, Donghwi Park. Healthcare (Basel) 2020
17
A multinational, multicentre study on the psychological outcomes and associated physical symptoms amongst healthcare workers during COVID-19 outbreak.
Nicholas W S Chew, Grace K H Lee, Benjamin Y Q Tan, Mingxue Jing, Yihui Goh, Nicholas J H Ngiam, Leonard L L Yeo, Aftab Ahmad, Faheem Ahmed Khan, Ganesh Napolean Shanmugam,[...]. Brain Behav Immun 2020
Nicholas W S Chew, Grace K H Lee, Benjamin Y Q Tan, Mingxue Jing, Yihui Goh, Nicholas J H Ngiam, Leonard L L Yeo, Aftab Ahmad, Faheem Ahmed Khan, Ganesh Napolean Shanmugam,[...]. Brain Behav Immun 2020
5
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.