Safety and Efficacy of Paxlovid Against Omicron Variants of Coronavirus Disease 2019 in Elderly Patients. - Weng, Chengzhao; Xie, Rongcheng; Han, Guanjie; Yuan, Ya; Li, Shiqin; Wang, Chao; Wang, Xiaofeng; Jiang, Wei; Jiang, Libo (Infectious Diseases & Therapy, 2023)