- Correspondence to Dr Tsung-Hsueh Lu, Department of Public Health, College of Medicine, National Cheng Kung University, No. 1, Dah Hsueh Road, Tainan 701, Taiwan;
- Received November 26, 2013
- Revised April 14, 2014
- Accepted May 26, 2014
- First published June 18, 2014.
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