- Correspondence to Dr Wei-cheng You, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Cancer Epidemiology, Peking University Cancer Hospital & Institute, 52 Fu-cheng Road, Hai-dian District, Beijing 100142, P. R. China; Dr. Meinhard Classen, Technische Universität München, International Digestive Cancer Alliance, 81675 Munich, Germany; firstname.lastname@example.org
- Received January 15, 2015
- Revised April 20, 2015
- Accepted April 24, 2015
- First published May 18, 2015.
This web only file has been produced by the BMJ Publishing Group from an electronic file supplied by the author(s) and has not been edited for content.
- Data supplement 1 - Online supplement
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.