- Correspondence to Professor Niang-Huei Peng, Nursing College, Central Taiwan University of Science and Technology, No.666 Pu-tzu Road Betiun District, Taichung city 40601, Taiwan;
- Received December 5, 2011
- Revised April 1, 2012
- Accepted April 9, 2012
- First published May 5, 2012.
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