Affiliation: | 1. Department of Pediatrics and Communicable Diseases, University of Michigan, Ann Arbor, Michigan;2. Center for Statistical Consultation and Research, University of Michigan, Ann Arbor, Michigan;3. College of Literature, Science, and the Arts, University of Michigan, Ann Arbor, Michigan;4. Wayne State School of Medicine, Detroit, Michigan;5. Departments of Pediatrics and Communicable Diseases and Neurology, University of Michigan, Ann Arbor, Michigan |