1 Center for Research on Healthcare, Division of General Internal Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. merlinjs@pitt.edu.
2 Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. merlinjs@pitt.edu.
3 Center for Research on Healthcare, Division of General Internal Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
4 Division of General Internal Medicine, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY, USA.