1Department of Medicine, Tulane University School of Medicine, New Orleans, Louisiana
2Department of Veteran Affairs, Malcom Randall VAMC, Gainesville, Florida
3University of Alabama at Birmingham (UAB), Department of Anesthesiology and Perioperative Medicine (Division of Pain Medicine), Neurology and Psychology, Birmingham, Alabama
4Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, Tennessee
5Division of Gastroenterology and Hepatology, Johns Hopkins University School of Medicine, Baltimore, Maryland
6Pediatric Pain and Palliative Care Program, Division of Pediatric Hematology-Oncology, David Geffen School of Medicine at UCLA, Los Angeles, California