1 Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts, USA.
2 Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.
3 Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.
4 Division of Sleep Medicine, Department of Otolaryngology-Head and Neck Surgery, Eastern Virginia Medical School, Children's Hospitals of The King's Daughters, Norfolk, Virginia, USA.
5 Department of Neurology, Michigan Medicine, Ann Arbor, Michigan, USA.
6 Children's Hospital of Philadelphia and University of Pennsylvania, Philadelphia, Pennsylvania, USA.
7 Department of Pediatrics, Michigan Medicine, Ann Arbor, Michigan, USA.
8 Rainbow Babies and Children's Hospital and University Hospitals, Cleveland, Ohio, USA.
9 Department of Otolaryngology-Head and Neck Surgery, Michigan Medicine, Ann Arbor, Michigan, USA.
10 Children's Medical Center of Dallas and UT Southwestern Medical Center, Dallas, Texas, USA.
11 University of Miami Health System and Miller School of Medicine, Miami, Florida, USA.
12 Department of Population Medicine, Harvard Pilgrim Health Care Institute, Boston, Massachusetts, USA.