1. Division of Epidemiology, Department of Public Health Sciences, School of Medicine and
2. Medical Investigations of Neurodevelopmental Disorders (MIND) Institute, University of California–Davis, Davis, California, USA
3. Division of Research, Kaiser Foundation Research Institute, Kaiser Permanente, Oakland, California, USA
4. Department of Pediatrics and
5. Department of Rheumatology/Allergy and Clinical Immunology, School of Medicine and
6. Department of Molecular Biosciences, School of Veterinary Medicine, University of California–Davis, Davis, California, USA