Yi-Jan Weng, Chin-Chang Cheng, Yen-Yao Li, Tsung-Jen Huang* and Robert WW Hsu
* Corresponding author: Tsung-Jen Huang tjhuang@adm.cgmh.org.tw
BMC Musculoskeletal Disorders 2010, 11:53 doi:10.1186/1471-2474-11-53