1 Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee.
2 Division of Allergy, Immunology, and Pulmonary Medicine, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee.
3 Center for Esophageal Diseases and Swallowing, Division of Gastroenterology and Hepatology, Department of Medicine, University of North Carolina School of Medicine, Chapel Hill, North Carolina.
4 Geospatial Data and Systems Research and Learning, Vanderbilt University, Nashville, Tennessee.
5 Division of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Monroe Carrell Jr. Children's Hospital at Vanderbilt University Medical Center, Nashville, Tennessee. Electronic address: [email protected].