Sathian, B., M. Asim, I. Banerjee, A. B. Pizarro, B. Roy, E. R. van Teijlingen, I. J. B. do Nascimento, and H. K. Alhamad. “Impact of COVID-19 on Clinical Trials and Clinical Research: A Systematic Review”. Nepal Journal of Epidemiology, vol. 10, no. 3, Sept. 2020, pp. 878-87, doi:10.3126/nje.v10i3.31622.