[1
]
Department of Internal Medicine, University of Pennsylvania Perelman School of Medicine,
Philadelphia, Pennsylvania.
[2
]
Gastroenterology Division, University of Pennsylvania Perelman School of Medicine,
Philadelphia, Pennsylvania; Center for Clinical Epidemiology and Biostatistics, University
of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.
[3
]
University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.
[4
]
Department of Internal Medicine, University of Pennsylvania Perelman School of Medicine,
Philadelphia, Pennsylvania; Gastroenterology Division, University of Pennsylvania
Perelman School of Medicine, Philadelphia, Pennsylvania; Wilmott Center for Endoscopic
Innovation, Research, and Training, Philadelphia, Pennsylvania. Electronic address:
michael.kochman@uphs.upenn.edu.