1. Department of Oncology, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China
2. Basic Research Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, Maryland, USA
3. Nutritional Science Research Group, Division of Cancer Prevention, National Cancer Institute, National Institutes of Health, Rockville, Maryland, USA
4. Department of Urinary Surgery, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China