- Correspondence to Dr Yanling Feng, Shanghai Public Health Clinical Center, 2901 Caolang Road, Jinshan, Shanghai 201508, China;
- Received May 29, 2014
- Revised September 17, 2014
- Accepted October 12, 2014
- First published November 6, 2014.
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.
Files in this Data Supplement:
- Data supplement 1 - Online figures
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.