Efficacy of BCG vaccination against COVID-19 in health care workers and non-health care workers: A meta-analysis of randomized controlled trials. - Xia, Zhuoyang; Meng, Jiahao; Wang, Xuanyu; Liu, Pan; Wu, Yumei; Xiong, Yilin; He, Baimei; Gao, Shuguang (PLoS ONE, 2025)