1. Depression (major depressive disorder) - Symptoms and causes - Mayo Clinic. Mayoclinic.org. 2017 Available from: https://www.mayoclinic.org/diseases-conditions/depression/symptoms-causes/syc-20356007 [Accessed 22 Dec 2017].
2. Murray CJ, Lopez AD. Evidence-based health policy--lessons from the global burden of disease study. Science 1996; 274:740–743. PubMed: 8966556 Available from: http://www.eurohex.eu/bibliography/pdf/0619262817/Murray_1996_Science.pdf [Accessed 3 Feb 2018].
3. Depression. World Health Organization. Available from: http://www.who.int/mediacentre/factsheets/fs369/en / Accessed 22 Feb 2018].
4. Khayyam-Nekouei Z, Neshatdoost H, Yousefy A, Sadeghi M, Manshaee G. Psychological factors and coronary heart disease. ARYA Atheroscler. 2013;9:102.
5. Khawaja IS, Westermeyer JJ, Gajwani P, Feinstein RE. Depression and coronary artery disease: the association, mechanisms, and therapeutic implications. Psychiatry (Edgemont). 2009;6:38–51.