- Correspondence to Dr Rebecca Li, Multi-Regional Clinical Trials Center of Brigham and Women's Hospital and Harvard, 14 Story Street, 4th Floor, Cambridge, MA 02138, USA;
- Received October 27, 2014
- Revised September 14, 2015
- Accepted December 14, 2015
- First published January 25, 2016.
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.