1. Children's Respiratory and Critical Care Specialists; Children's Hospitals and Clinics of Minnesota; Minneapolis MN USA
2. Pediatric Emergency Medicine Associates; Children's Healthcare of Atlanta at Scottish Rite Hospital; Atlanta GA USA
3. Department of Anesthesiology; Boston Children's Hospital; Boston MA USA
4. Department of Pediatrics; St Louis University at Cardinal Glennon Children's Hospital; St Louis MO USA
5. Department of Anesthesiology and Critical Care Medicine; Alfred I duPont Hospital for Children; Wilmington DE USA
6. Division of Pediatric Critical Care; Department of Pediatrics; University of Louisville; Louisville KY USA