1. Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, Bethesda, Maryland
2. Health Sciences Research, Mayo Clinic, Jacksonville, Florida
3. Laboratory of Stem Cell and Cancer Biology, Division of Experimental Pathology and Laboratory Medicine, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
4. Departments of Obstetrics and Gynecology, and Preventive Medicine, University of Southern California Keck School of Medicine, Los Angeles, California