Correspondence Address correspondence to: Klaus H. Kaestner, PhD, MS, Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104.; Editor-in-Chief, CMGH
Michael Pack, MD
Michael Pack, MD, Division of Gastroenterology, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104.; Editor-in-Chief, CMGH