Division of Pediatric Gastroenterology;
Hepatology;
and Nutrition;
Department of Pediatrics;
The Johns Hopkins University School of Medicine;
Baltimore;
MD 21287;
United States;
Department of Medicine;
University of Florida College of Medicine;
Gainesville;
FL 32610;
United States;
Colorectal cancer; CFTR gene; Cystic fibrosis; Gastrointestinal cancer; Hepatopancreatobiliary cancer; Screening;