1. Center for Genetic Epidemiology, Department of Population and Public Health Sciences Keck School of Medicine of the University of Southern California Los Angeles California USA
2. Department of Paediatrics and MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine Oxford University and BRC Blood Theme, NIHR Oxford Biomedical Centre Oxford UK
3. Department of Neurological Surgery University of California San Francisco San Francisco California USA
4. School of Public Health University of California, Berkeley Berkeley California USA
5. Department of Chronic Disease Epidemiology Yale School of Public Health New Haven Connecticut USA
6. Public Health Sciences Division, Fred Hutchinson Cancer Research Center, and Department of Epidemiology University of Washington Seattle Washington USA
7. Department of Neurosurgery Duke University Durham North Carolina USA
8. Department of Human Genetics David Geffen School of Medicine, University of California Los Angeles California USA