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Affiliations

• ¹ Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
• ² Division of Gastroenterology, Hepatology, and Nutrition, University of Minnesota, Minneapolis, Minnesota.
• ³ Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, New York.
• ⁴ Medical Department, Cystic Fibrosis Foundation, Bethesda, Maryland.
• ⁵ Unit of Clinical Epidemiology, Division of Epidemiology and Biostatistics, European Institute of Oncology, Milan, Italy.
• ⁶ New York Medical College, Valhalla, New York.