- Correspondence to Dr Hude Quan, Department of Community Health Sciences, University of Calgary, 3280 Hospital Dr NW, Calgary, Alberta, Canada T2N 4Z6;
- Received October 3, 2012
- Revised December 22, 2012
- Accepted December 27, 2012
- First published February 12, 2013.
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.