1. Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and GeneticsNational Cancer Institute, National Institutes of Health Rockville MD USA
2. Institute for Risk Assessment Sciences, Division of Environmental EpidemiologyUtrecht University Utrecht The Netherlands
3. Saw Swee Hock School of Public HealthNational University of Singapore Singapore Singapore
4. Department of Medicine, Yong Loo Lin School of MedicineNational University of Singapore and National University Health System Singapore Singapore
5. School of Public Health, Li Ka Shing Faculty of MedicineThe University of Hong Kong Hong Kong Special Administrative Region of China
6. Qujing Center for Diseases Control and Prevention Qujing Yunnan China
7. Kunming Tumor Hospital Kunming Yunnan China
8. Caromont Inpatient Physicians Gastonia NC USA