. 2016 Jan 27;37(1):7–13. doi: 10.4082/kjfm.2016.37.1.7
Copyright © 2016 The Korean Academy of Family Medicine
This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.