1. Heart and Vascular Institute, Department of Internal Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
2. Division of Infectious Diseases, Department of Internal Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
3. Department of Obstetrics and Gynecology, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
4. Division of Infectious Diseases, Department of Internal Medicine, University of Kentucky Medical Center, 3101 Beaumont Centre Circle, Lexington, KY 40513, USA