1 Division of General Internal Medicine, Section of Hospital Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.
2 Department of Medicine, New York University Grossman School of Medicine, New York, New York, USA.
3 Department of Medicine, Loma Linda University, Loma Linda, California, USA.
4 Section of Hospital Medicine, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA.