1. Pediatric Cardiac Critical Care Medicine, Children's National Heart Institute, Washington, DC, USA
2. Quantitative Sciences Unit, Department of Medicine, Stanford University School of Medicine, Palo Alto, CA, USA
3. Pediatric Critical Care Medicine, Stanford University School of Medicine, Palo Alto, CA, USA
4. Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Palo Alto, CA, USA
5. Lucile Packard Children's Hospital, Stanford Children's Health, Palo Alto, CA, USA
6. Academic General Pediatrics, Stanford University School of Medicine, Palo Alto, CA, USA