1. World Health Organisation. Basic documents: forty-ninth edition (including amendments adopted up to 31 May 2019). Geneva: World Health Organization; 2020. p. 6.
2. AhmadiGatab T, Shayan N, Taheri M. The relationship between psychological health, happiness and life quality in the students. Procedia Soc Behav Sci. 2011;30:1983–5.
3. World Health Organization. The WHO special initiative for mental health (2019–2023): universal health coverage for mental health. World Health Organization; 2019.
4. American Psychiatric Association. Diagnostic and statistical manual of mental disorders. 5th ed. Arlington, VA: American Psychiatric Association; 2013.
5. Slade T, Johnston A, Oakley Browne MA, Andrews G, Whiteford H. National Survey of Mental Health and wellbeing: methods and key findings. Aust N Z J Psychiatry. 2007;2009(43):594–605.