- Correspondence to Professor Yu-Jin Paek, Department of Family Medicine and Health Promotion Center, Hallym University Sacred Heart Hospital, 896 Pyungchon-dong, Dongan-ku, Anyang-si, Gyeonggi-do, Republic of Korea 431-070;
- Received August 10, 2009
- Accepted February 23, 2010
- First published May 27, 2010.
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