- Correspondence to Dr Yawen Cheng, Institute of Health Policy and Management, College of Public Health, National Taiwan University, 17 Xu-Zhou Rd., Taipei 100, Taiwan;
- Received 14 June 2016
- Revised 28 September 2016
- Accepted 19 October 2016
- Published online 15 June 2017.
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.