1. World Health Organization.Depression: Fact Sheet. Geneva: WHO;2018.http://www.who.int/en/news-room/fact-sheets/detail/depression[updated 22 Mar 2018; Accessed 15 May 2018.]
2. American Psychiatric Association.What Is Depression?Washington DC USA: APA;2017.https://www.psychiatry.org/patients-families/depression/what-is-depression[Accessed 15 May 2018.]
3. Depressive symptoms, socio-economic background, sense of control, and cultural factors in University students from 23 Countries
4. Burnout, depression and depersonalisation–psychological factors and coping strategies in dental and medical students;Prinz P;GMS Z Med Ausbild,2012
5. Depression and the influencing factors of medical college students in Guangzhou;Zhang ZW;Chin J Sch Health,2006