1. Stanford University School of Medicine, Stanford, California, USA
2. California Department of Health Services, Sacramento, California, USA
3. California Department of Health Services, Sacramento, California, USASanta Clara Valley Medical Center, San Jose, California, USA
4. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
5. Stanford University School of Medicine, Stanford, California, USAKaiser Permanente Medical Group, Redwood City, California, USA