Tsair-Wei Chien, Wen-Pin Lai, Chih-Wei Lu, Weng-Chung Wang, Shih-Chung Chen, Hsien-Yi Wang and Shih-Bin Su*
* Corresponding author: Shih-Bin Su shihbin.su@msa.hinet.net
BMC Medical Research Methodology 2011, 11:47 doi:10.1186/1471-2288-11-47