1 Department of Pediatrics & Communicable Diseases, University of Michigan, Ann Arbor, MI, USA. Electronic address: shellhaa@med.umich.edu.
2 Department of Neurology, UCSF Benioff Children'sHospital, University of California San Francisco, San Francisco, CA, USA; Department of Pediatrics, UCSF Benioff Children's Hospital, University of California San Francisco, San Francisco, CA, USA; Department of Epidemiology & Biostatistics, University of California San Francisco, San Francisco, CA, USA. Electronic address: Hannah.Glass@ucsf.edu.