1 Division of Allergy, Immunology, and Rheumatology, Department of Pediatrics, Stanford University School of Medicine, Stanford, Calif. Electronic address: yunqij@stanford.edu.
2 Department of Pediatrics, Stanford University School of Medicine, Stanford, Calif.
3 Department of Dermatology, Stanford University School of Medicine, Stanford, Calif.
4 Division of Allergy, Immunology, and Rheumatology, Department of Pediatrics, Stanford University School of Medicine, Stanford, Calif.
5 Division of Pediatric Infectious Diseases, Department of Pediatrics, Stanford University School of Medicine, Stanford, Calif.
6 Division of Pediatric Hospital Medicine, Department of Pediatrics, Stanford University School of Medicine, Stanford, Calif.