1. Digestive Health Institute, Children's Hospital Colorado, Gastrointestinal Eosinophilic Diseases Program, Section of Pediatric Gastroenterology, Hepatology and Nutrition, University of Colorado School of Medicine, Aurora, Colorado, USA;
2. Department of Pathology, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA;
3. Department of Pathology and Laboratory Medicine, Children's Hospital Colorado, Aurora, Colorado, USA;
4. Child Health Biostatistics Core, Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado, USA;
5. Gastrointestinal Eosinophilic Diseases Program, Section of Allergy and Immunology, Children's Hospital Colorado, University of Colorado School of Medicine, Aurora, Colorado, USA.