. 2012 Feb 23;27(3):255–260. doi: 10.3346/jkms.2012.27.3.255
© 2012 The Korean Academy of Medical Sciences.
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 non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Table 1.
Characteristics of the study population
