Key references: Disorders that can cause depressive symptoms
American Psychiatric Association. Diagnostic and statistical manual of mental disorders (DSM-5). 5th Washington, DC: American Psychiatric Association Publishing; 2013. https://www.psychiatry.org/psychiatrists/practice/dsm
Malhi GS, Bassett D, Boyce P, Bryant R, Fitzgerald PB, Fritz K, et al. Royal Australian and New Zealand College of Psychiatrists clinical practice guidelines for mood disorders. Aust N Z J Psychiatry 2015;49(12):1087–206. https://www.ncbi.nlm.nih.gov/pubmed/26643054