Lavanya L, Iniyan Selvamani, Venkatraman Natarajan, and Raman K, “Prevalence of depression, anxiety and stress symptoms and their association with quality of sleep and loneliness in the general population during the COVID-19 pandemic in India”, Int. J. Res. Pharm. Sci., vol. 11, no. (SPL 1), pp. 1819–1829, Dec. 2020.