1. Division of Pediatric Hospital Medicine, Palo Alto Foundation Medical Group and
2. Palo Alto Medical Foundation Research Institute, Palo Alto Medical Foundation, Sutter Health, Palo Alto, California; and
3. Divisions of Pediatric Cardiology and
4. Department of Pediatrics, Stanford Medicine, Stanford University, Stanford, California
5. Clinical Virology Laboratory, Department of Pathology and
6. Pediatric Infectious Disease and