- Correspondence to Dr Gwen Murphy, Nutritional Epidemiology Branch, DCEG, National Cancer Institute, 6120 Executive Blvd., EPS 3034, Rockville, MD 20892, USA;
- Prof You-Lin Qiao, Department of Cancer Epidemiology, Cancer Institute, Chinese Academy of Medical Sciences, P.O. Box 2258, Beijing 100021, People's Republic of China;
- Revised November 22, 2010
- Accepted November 25, 2010
- First published January 17, 2011.
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