Cancer Epidemiol Biomarkers Prev 2014 May 11;23(5):876-81. Epub 2014 Mar 11.
Authors' Affiliations: Departments of Epidemiology; and Biostatistics, University of California, Berkeley; Department of Epidemiology and Biostatistics, University of California, San Francisco; Department of Pediatric Oncology, Children's Hospital Central California, Madera; and Division of Pediatric Hematology/Oncology, UCLA David Geffen School of Medicine, Los Angeles, California.