1. College of Medicine, University of California, San Francisco, San Francisco, California;
2. David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California;
3. Imperial Centre for Paediatrics and Child Health, Imperial College, London, United Kingdom;
4. Pulmonary and Critical Care Medicine Division, Morehouse School of Medicine, Atlanta, Georgia;
5. Novartis Beacon of Hope Center of Excellence for Data Standards in Clinical Medicine, Atlanta, Georgia; and
6. University of Kentucky College of Medicine, Lexington, Kentucky