1 Department of Epidemiology, School of Public Health, University of California, Los Angeles, CA.
2 Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA.
3 Department of Pediatrics, Division of Neonatology and Developmental Biology, David Geffen School of Medicine, Mattel Children's Hospital, University of California, Los Angeles, CA.
4 Department of Neurology, Department of Clinical Medicine, Aarhus University Hospital, Aarhus, Denmark.
5 National Center for Register-based Research, Department of Economics and Business Economics, Business and Social Science, Aarhus University, Aarhus, Denmark.
6 Department of Clinical Epidemiology, Aarhus University, Aarhus, Denmark.
7 Danish Cancer Society Research Center, Copenhagen, Denmark.