1. Center for Environmental Oncology, University of Pittsburgh Cancer Institute and Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
2. Feinberg School of Medicine, Northwestern University, Evanston, Illinois, USA
3. Center for Research on Minority Health, University of Texas M.D. Anderson Cancer Center, Houston, Texas, USA
4. Yokohama City University, School of Medicine, Yokohama, Japan