McCreary Erin K, Meyer Nuala J
Department of Medicine, Division of Infectious Diseases, UPMC Health System and the University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
BMJ. 2021 Jan 27;372:n244. doi: 10.1136/bmj.n244.