| Affiliation: | 1. Pediatric Gastroenterology, Greenville Health System, University of South Carolina, Greenville, South Carolina, USA;2. Pediatrics, University of North Carolina, Chapel Hill, North Carolina, USA;3. Pediatrics, New York University, New York, New York, USA;4. Pediatrics, University of Miami, Miami, Florida, USA;5. Public Policy, University of North Carolina, Chapel Hill, North Carolina, USA;6. Center for Health Services Research, Vanderbilt University Medical Center, Nashville, Tennessee, USA;7. Biostatistics, Vanderbilt University Medical Center, Nashville, Tennessee, USA |
