1. Division of Pulmonary Medicine and Sleep Center, The Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
2. University of Minnesota School of Medicine, Children's Hospitals and Clinics of Minnesota, Pediatric Sleep Disorders Program, St Paul, Minnesota
3. Division of Pediatric Pulmonology, Childrens Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California
4. The Eudowood Division of Pediatric Respiratory Sciences, Johns Hopkins University, Baltimore, Maryland
5. Gordon & Associates, Berkeley, California