Institutional Review Board (IRB) Review of Individual Patient Expanded Access Requests for Investigational Drugs and Biological Products During the COVID-19 Public Health Emergency Guidance for IRBs and Clinical Investigators: Guidance for IRBs and Clinical Investigators(在COVID-19公共卫生紧急事件期间，机构审查委员会(IRB)对个体患者扩大获取研究药物和生物制品的请求进行审查-IRB和临床研究人员指南： IRB 和临床研究者指南)