Bhattacharya, R., Chowdhury, S., Nandi, A., Mukherjee, R., Kulshrestha, M., Ghosh, R. and Saha, S. (2020) “Pre-exposure hydroxychloroquine prophylaxis for COVID-19 in healthcare workers: a retrospective cohort”, International Journal of Research in Medical Sciences, 9(1), pp. 89–96. doi: 10.18203/2320-6012.ijrms20205444.