Branda Yee-Man Yu, Wing-Fai Yeung, Jason Chun-Sing Lam, Sam Chun-Sum Yuen, Simon Ching Lam, Vincent Chi-Ho Chung, Ka-Fai Chung, Paul Hong Lee, Fiona Yan-Yee Ho, Janice Yuen-Shan Ho. Sleep Med 2020
Times Cited: 37
Times Cited: 37
Times Cited
Times Co-cited
Similarity
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
29
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
29
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
27
Effects of Covid-19 Lockdown on Mental Health and Sleep Disturbances in Italy.
Maria Rosaria Gualano, Giuseppina Lo Moro, Gianluca Voglino, Fabrizio Bert, Roberta Siliquini. Int J Environ Res Public Health 2020
Maria Rosaria Gualano, Giuseppina Lo Moro, Gianluca Voglino, Fabrizio Bert, Roberta Siliquini. Int J Environ Res Public Health 2020
27
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
24
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
21
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
21
Depression, Anxiety and Stress during COVID-19: Associations with Changes in Physical Activity, Sleep, Tobacco and Alcohol Use in Australian Adults.
Robert Stanton, Quyen G To, Saman Khalesi, Susan L Williams, Stephanie J Alley, Tanya L Thwaite, Andrew S Fenning, Corneel Vandelanotte. Int J Environ Res Public Health 2020
Robert Stanton, Quyen G To, Saman Khalesi, Susan L Williams, Stephanie J Alley, Tanya L Thwaite, Andrew S Fenning, Corneel Vandelanotte. Int J Environ Res Public Health 2020
21
Impact of COVID-19 lockdown on sleep quality in university students and administration staff.
Sara Marelli, Alessandra Castelnuovo, Antonella Somma, Vincenza Castronovo, Samantha Mombelli, Daniela Bottoni, Caterina Leitner, Andrea Fossati, Luigi Ferini-Strambi. J Neurol 2021
Sara Marelli, Alessandra Castelnuovo, Antonella Somma, Vincenza Castronovo, Samantha Mombelli, Daniela Bottoni, Caterina Leitner, Andrea Fossati, Luigi Ferini-Strambi. J Neurol 2021
21
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
18
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
18
Sleep quality and mental health in the context of COVID-19 pandemic and lockdown in Morocco.
Abdelkrim Janati Idrissi, Abdelaziz Lamkaddem, Abdelilah Benouajjit, Manar Ben El Bouaazzaoui, Farah El Houari, Mohammed Alami, Sanae Labyad, Abderrahman Chahidi, Meryem Benjelloun, Samira Rabhi,[...]. Sleep Med 2020
Abdelkrim Janati Idrissi, Abdelaziz Lamkaddem, Abdelilah Benouajjit, Manar Ben El Bouaazzaoui, Farah El Houari, Mohammed Alami, Sanae Labyad, Abderrahman Chahidi, Meryem Benjelloun, Samira Rabhi,[...]. Sleep Med 2020
18
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
18
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
18
Mental Health and Psychosocial Problems of Medical Health Workers during the COVID-19 Epidemic in China.
Wen-Rui Zhang, Kun Wang, Lu Yin, Wen-Feng Zhao, Qing Xue, Mao Peng, Bao-Quan Min, Qing Tian, Hai-Xia Leng, Jia-Lin Du,[...]. Psychother Psychosom 2020
Wen-Rui Zhang, Kun Wang, Lu Yin, Wen-Feng Zhao, Qing Xue, Mao Peng, Bao-Quan Min, Qing Tian, Hai-Xia Leng, Jia-Lin Du,[...]. Psychother Psychosom 2020
16
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
16
Social Capital and Sleep Quality in Individuals Who Self-Isolated for 14 Days During the Coronavirus Disease 2019 (COVID-19) Outbreak in January 2020 in China.
Han Xiao, Yan Zhang, Desheng Kong, Shiyue Li, Ningxi Yang. Med Sci Monit 2020
Han Xiao, Yan Zhang, Desheng Kong, Shiyue Li, Ningxi Yang. Med Sci Monit 2020
16
Sleep problems among Chinese adolescents and young adults during the coronavirus-2019 pandemic.
Shuang-Jiang Zhou, Lei-Lei Wang, Rui Yang, Xing-Jie Yang, Li-Gang Zhang, Zhao-Chang Guo, Jin-Cheng Chen, Jing-Qi Wang, Jing-Xu Chen. Sleep Med 2020
Shuang-Jiang Zhou, Lei-Lei Wang, Rui Yang, Xing-Jie Yang, Li-Gang Zhang, Zhao-Chang Guo, Jin-Cheng Chen, Jing-Qi Wang, Jing-Xu Chen. Sleep Med 2020
16
The immediate impact of the 2019 novel coronavirus (COVID-19) outbreak on subjective sleep status.
Li-Yu Lin, Jie Wang, Xiao-Yong Ou-Yang, Qing Miao, Rui Chen, Feng-Xia Liang, Yang-Pu Zhang, Qing Tang, Ting Wang. Sleep Med 2021
Li-Yu Lin, Jie Wang, Xiao-Yong Ou-Yang, Qing Miao, Rui Chen, Feng-Xia Liang, Yang-Pu Zhang, Qing Tang, Ting Wang. Sleep Med 2021
16
Insomnia during COVID-19 pandemic and lockdown: Prevalence, severity, and associated risk factors in French population.
Cyrille Kossigan Kokou-Kpolou, Olga Megalakaki, Dimitra Laimou, Marina Kousouri. Psychiatry Res 2020
Cyrille Kossigan Kokou-Kpolou, Olga Megalakaki, Dimitra Laimou, Marina Kousouri. Psychiatry Res 2020
16
Insomnia and psychological reactions during the COVID-19 outbreak in China.
Yun Li, Qingsong Qin, Qimeng Sun, Larry D Sanford, Alexandros N Vgontzas, Xiangdong Tang. J Clin Sleep Med 2020
Yun Li, Qingsong Qin, Qimeng Sun, Larry D Sanford, Alexandros N Vgontzas, Xiangdong Tang. J Clin Sleep Med 2020
16
Prevalence and Demographic Correlates of Poor Sleep Quality Among Frontline Health Professionals in Liaoning Province, China During the COVID-19 Outbreak.
Yifang Zhou, Yuan Yang, Tieying Shi, Yanzhuo Song, Yuning Zhou, Zhibo Zhang, Yanan Guo, Xixi Li, Yongning Liu, Guojun Xu,[...]. Front Psychiatry 2020
Yifang Zhou, Yuan Yang, Tieying Shi, Yanzhuo Song, Yuning Zhou, Zhibo Zhang, Yanan Guo, Xixi Li, Yongning Liu, Guojun Xu,[...]. Front Psychiatry 2020
19
Effects of the COVID-19 lockdown on human sleep and rest-activity rhythms.
Christine Blume, Marlene H Schmidt, Christian Cajochen. Curr Biol 2020
Christine Blume, Marlene H Schmidt, Christian Cajochen. Curr Biol 2020
16
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
13
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
13
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
13
Sleep quality during the COVID-19 pandemic: not one size fits all.
Desana Kocevska, Tessa F Blanken, Eus J W Van Someren, Lara Rösler. Sleep Med 2020
Desana Kocevska, Tessa F Blanken, Eus J W Van Someren, Lara Rösler. Sleep Med 2020
13
Covid-19 health crisis and lockdown associated with high level of sleep complaints and hypnotic uptake at the population level.
Francois Beck, Damien Léger, Lisa Fressard, Patrick Peretti-Watel, Pierre Verger. J Sleep Res 2021
Francois Beck, Damien Léger, Lisa Fressard, Patrick Peretti-Watel, Pierre Verger. J Sleep Res 2021
13
COVID-19-Related Factors Associated with Sleep Disturbance and Suicidal Thoughts among the Taiwanese Public: A Facebook Survey.
Dian-Jeng Li, Nai-Ying Ko, Yi-Lung Chen, Peng-Wei Wang, Yu-Ping Chang, Cheng-Fang Yen, Wei-Hsin Lu. Int J Environ Res Public Health 2020
Dian-Jeng Li, Nai-Ying Ko, Yi-Lung Chen, Peng-Wei Wang, Yu-Ping Chang, Cheng-Fang Yen, Wei-Hsin Lu. Int J Environ Res Public Health 2020
13
The examination of sleep quality for frontline healthcare workers during the outbreak of COVID-19.
Haitham Jahrami, Ahmed S BaHammam, Haifa AlGahtani, Ahmed Ebrahim, MoezAlIslam Faris, Kawthar AlEid, Zahra Saif, Eman Haji, Ali Dhahi, Hussain Marzooq,[...]. Sleep Breath 2021
Haitham Jahrami, Ahmed S BaHammam, Haifa AlGahtani, Ahmed Ebrahim, MoezAlIslam Faris, Kawthar AlEid, Zahra Saif, Eman Haji, Ali Dhahi, Hussain Marzooq,[...]. Sleep Breath 2021
13
Psychological distress and sleep quality of COVID-19 patients in Wuhan, a lockdown city as the epicenter of COVID-19.
ZiYi Jiang, PeiPei Zhu, LiYuan Wang, Ying Hu, MingFan Pang, ShunShing Ma, Xin Tang. J Psychiatr Res 2021
ZiYi Jiang, PeiPei Zhu, LiYuan Wang, Ying Hu, MingFan Pang, ShunShing Ma, Xin Tang. J Psychiatr Res 2021
22
Changes in sleep timing and subjective sleep quality during the COVID-19 lockdown in Italy and Belgium: age, gender and working status as modulating factors.
Nicola Cellini, Francesca Conte, Oreste De Rosa, Fiorenza Giganti, Serena Malloggi, Mathilde Reyt, Camille Guillemin, Christina Schmidt, Vincenzo Muto, Gianluca Ficca. Sleep Med 2021
Nicola Cellini, Francesca Conte, Oreste De Rosa, Fiorenza Giganti, Serena Malloggi, Mathilde Reyt, Camille Guillemin, Christina Schmidt, Vincenzo Muto, Gianluca Ficca. Sleep Med 2021
13
Psychological health, sleep quality, and coping styles to stress facing the COVID-19 in Wuhan, China.
Wenning Fu, Chao Wang, Li Zou, Yingying Guo, Zuxun Lu, Shijiao Yan, Jing Mao. Transl Psychiatry 2020
Wenning Fu, Chao Wang, Li Zou, Yingying Guo, Zuxun Lu, Shijiao Yan, Jing Mao. Transl Psychiatry 2020
13
Sleep disturbances among Chinese residents during the Coronavirus Disease 2019 outbreak and associated factors.
Jing Wang, Yanhong Gong, Zhenyuan Chen, Jianxiong Wu, Jie Feng, Shijiao Yan, Chuanzhu Lv, Zuxun Lu, Ketao Mu, Xiaoxv Yin. Sleep Med 2020
Jing Wang, Yanhong Gong, Zhenyuan Chen, Jianxiong Wu, Jie Feng, Shijiao Yan, Chuanzhu Lv, Zuxun Lu, Ketao Mu, Xiaoxv Yin. Sleep Med 2020
27
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
13
The Insomnia Severity Index: psychometric indicators to detect insomnia cases and evaluate treatment response.
Charles M Morin, Geneviève Belleville, Lynda Bélanger, Hans Ivers. Sleep 2011
Charles M Morin, Geneviève Belleville, Lynda Bélanger, Hans Ivers. Sleep 2011
13
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
10
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
10
Association Between Depression, Health Beliefs, and Face Mask Use During the COVID-19 Pandemic.
Daniel Thomas Bressington, Teris Cheuk Chi Cheung, Simon Ching Lam, Lorna Kwai Ping Suen, Tommy Kwan Hin Fong, Hilda Sze Wing Ho, Yu-Tao Xiang. Front Psychiatry 2020
Daniel Thomas Bressington, Teris Cheuk Chi Cheung, Simon Ching Lam, Lorna Kwai Ping Suen, Tommy Kwan Hin Fong, Hilda Sze Wing Ho, Yu-Tao Xiang. Front Psychiatry 2020
19
Profiles of sleep changes during the COVID-19 pandemic: Demographic, behavioural and psychological factors.
Rebecca Robillard, Karianne Dion, Marie-Helene Pennestri, Elizaveta Solomonova, Elliott Lee, Mysa Saad, Anthony Murkar, Roger Godbout, Jodi D Edwards, Lena Quilty,[...]. J Sleep Res 2021
Rebecca Robillard, Karianne Dion, Marie-Helene Pennestri, Elizaveta Solomonova, Elliott Lee, Mysa Saad, Anthony Murkar, Roger Godbout, Jodi D Edwards, Lena Quilty,[...]. J Sleep Res 2021
10
Stay-at-home circumstances do not produce sleep disorders: An international survey during the COVID-19 pandemic.
Yulia Roitblat, Jacob Burger, Aidan Leit, Liliia Nehuliaieva, Gulrukh Sh Umarova, Vitalii Kaliberdenko, Shanmugaraj Kulanthaivel, Noa Buchris, Michael Shterenshis. J Psychosom Res 2020
Yulia Roitblat, Jacob Burger, Aidan Leit, Liliia Nehuliaieva, Gulrukh Sh Umarova, Vitalii Kaliberdenko, Shanmugaraj Kulanthaivel, Noa Buchris, Michael Shterenshis. J Psychosom Res 2020
17
Editorial Perspective: Perils and promise for child and adolescent sleep and associated psychopathology during the COVID-19 pandemic.
Stephen P Becker, Alice M Gregory. J Child Psychol Psychiatry 2020
Stephen P Becker, Alice M Gregory. J Child Psychol Psychiatry 2020
10
Sleep health early in the coronavirus disease 2019 (COVID-19) outbreak in the United States: integrating longitudinal, cross-sectional, and retrospective recall data.
Chenlu Gao, Michael K Scullin. Sleep Med 2020
Chenlu Gao, Michael K Scullin. Sleep Med 2020
10
Changes in sleep pattern and sleep quality during COVID-19 lockdown.
Ravi Gupta, Sandeep Grover, Aniruddha Basu, Vijay Krishnan, Adarsh Tripathi, Alka Subramanyam, Anil Nischal, Arshad Hussain, Aseem Mehra, Atul Ambekar,[...]. Indian J Psychiatry 2020
Ravi Gupta, Sandeep Grover, Aniruddha Basu, Vijay Krishnan, Adarsh Tripathi, Alka Subramanyam, Anil Nischal, Arshad Hussain, Aseem Mehra, Atul Ambekar,[...]. Indian J Psychiatry 2020
10
Sleep quality in times of Covid-19 pandemic.
Josué Pinto, Mafalda van Zeller, Pedro Amorim, Ana Pimentel, Patrícia Dantas, Ermelinda Eusébio, Andreia Neves, Joana Pipa, Elisabete Santa Clara, Teresa Santiago,[...]. Sleep Med 2020
Josué Pinto, Mafalda van Zeller, Pedro Amorim, Ana Pimentel, Patrícia Dantas, Ermelinda Eusébio, Andreia Neves, Joana Pipa, Elisabete Santa Clara, Teresa Santiago,[...]. Sleep Med 2020
10
Effects of lockdown on human sleep and chronotype during the COVID-19 pandemic.
María Juliana Leone, Mariano Sigman, Diego Andrés Golombek. Curr Biol 2020
María Juliana Leone, Mariano Sigman, Diego Andrés Golombek. Curr Biol 2020
10
Sleep disturbances among physicians during COVID-19 pandemic.
Yasser H Alnofaiey, Haneen A Alshehri, Maram M Alosaimi, Shrooq H Alswat, Raghad H Alswat, Rahaf M Alhulayfi, Meteb A Alghamdi, Reem M Alsubaie. BMC Res Notes 2020
Yasser H Alnofaiey, Haneen A Alshehri, Maram M Alosaimi, Shrooq H Alswat, Raghad H Alswat, Rahaf M Alhulayfi, Meteb A Alghamdi, Reem M Alsubaie. BMC Res Notes 2020
22
The evaluation of sleep disturbances for Chinese frontline medical workers under the outbreak of COVID-19.
Jing Qi, Jing Xu, Bo-Zhi Li, Jin-Sha Huang, Yuan Yang, Zhen-Tao Zhang, Dong-Ai Yao, Qun-Hui Liu, Min Jia, Dao-Kai Gong,[...]. Sleep Med 2020
Jing Qi, Jing Xu, Bo-Zhi Li, Jin-Sha Huang, Yuan Yang, Zhen-Tao Zhang, Dong-Ai Yao, Qun-Hui Liu, Min Jia, Dao-Kai Gong,[...]. Sleep Med 2020
10
Analysis of Psychological and Sleep Status and Exercise Rehabilitation of Front-Line Clinical Staff in the Fight Against COVID-19 in China.
Koulong Wu, Xuemei Wei. Med Sci Monit Basic Res 2020
Koulong Wu, Xuemei Wei. Med Sci Monit Basic Res 2020
10
Sleep disturbances among medical workers during the outbreak of COVID-2019.
S Wang, L Xie, Y Xu, S Yu, B Yao, D Xiang. Occup Med (Lond) 2020
S Wang, L Xie, Y Xu, S Yu, B Yao, D Xiang. Occup Med (Lond) 2020
10
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.