N. N. . Mathur, S. . Arora, S. K. . Rasania, M. B. . Jais, and T. . Talukdar, “A retrospective cohort study to find out the association of hydroxychloroquine prophylaxis and COVID 19 infection prevention among health care workers in a tertiary care hospital of New Delhi”, Indian J Community Health, vol. 33, no. 2, pp. 250–255, Jun. 2021.