Sathian B, Asim M, Banerjee I, Pizarro AB, Roy B, van Teijlingen ER, Nascimento IJB do, Alhamad HK. Impact of COVID-19 on clinical trials and clinical research: A systematic review. Nepal J Epidemiology [Internet]. 2020 Sep. 30 [cited 2024 Dec. 26];10(3):878-87. Available from: https://nepjol.info./index.php/NJE/article/view/31622