1 Digestive Health Institute, Children's Hospital Colorado, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colo. Electronic address: [email protected].
2 Department of Biostatistics, University of Colorado School of Medicine, Aurora, Colo.
3 Digestive Health Institute, Children's Hospital Colorado, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colo.
4 Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio.