Jennie H Kwon1, William G Powderly2. 1. Jennie H. Kwon is an assistant professor in the Division of Infectious Diseases in the Department of Medicine at the Washington University School of Medicine, St. Louis, MO, USA. j.kwon@wustl.edu. 2. William G. Powderly is a professor in the Division of Infectious Diseases in the Department of Medicine at the Washington University School of Medicine, St. Louis, MO, USA. wpowderly@wustl.edu.