Singh, S., P. Sharma, and V. Gautam. “Role of Vitamin D Supplementation As Adjunctive Therapy to Escitalopram in Patients of Major Depressive Disorder: A 8 Week Prospective, Randomized, Interventional, Clinical Study”. International Journal of Basic & Clinical Pharmacology, vol. 8, no. 8, July 2019, pp. 1713-6, doi:10.18203/2319-2003.ijbcp20193168.