“Effect of common maintenance drugs on the risk and severity of COVID-19 in elderly patients,” by Kin Wah Fung, Seo H. Baik, Fitsum Baye, Zhaonian Zheng, Vojtech Huser, and Clement J. McDonald (PLoS ONE 17(4): e0266922. doi.org/10.1371/journal.pone.0266922, XML, HTML, and .pdf format, 15p.).
journals.plos.org/plosone/article?id=10.1371/journal.pone.0266922
