Division of Pediatric Gastroenterology, University of Texas Southwestern Medical Center, Children's Health, Dallas, Texas, USA

Correspondence to David M. Troendle, MD, Division of Pediatric Gastroenterology, University of Texas Southwestern Medical Center, Children's Health, Dallas, 2350 N. Stemmons Fwy Ste F4500, Dallas, TX 75207, USA. Tel: +1 214 456 8000; e-mail: [email protected]