- Correspondence to Dr Hiang-Ping Chan, Division of Respiratory and Critical Care Medicine, University Medicine Cluster, National University Health System, 1E Kent Ridge Rd, Singapore 119228, Singapore;
- Received June 3, 2016
- Revised July 8, 2016
- Accepted August 3, 2016
- First published August 31, 2016.
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.