1. Department of Non-Communicable Disease Epidemiology; London School of Hygiene and Tropical Medicine; London UK
2. Cancer Prevention Institute of California; Fremont CA USA
3. Department of Medical Statistics; London School of Hygiene and Tropical Medicine; London UK
4. Epidemiology Unity and Cancer Registry of Girona; Girona Biomedical Research Institute; Girona Spain
5. Division of Hematology; Stanford University School of Medicine; Stanford CA USA
6. Leukemia and Lymphoma Division; Department of Oncology; St. Jude Children's Research Hospital; Memphis TN USA
7. Division of Hematology and Oncology; Department of Internal Medicine; University of California Davis School of Medicine; Sacramento CA USA