Sang-Don Park, Chang-Hwan Yoon, Il-Young Oh, Jung-Won Suh, Young-Suk Cho, Tae-Jin Youn, Dong-Ju Choi and In-Ho Chae*
* Corresponding author: In-Ho Chae ihchae@snu.ac.kr
Trials 2013, 14:38 doi:10.1186/1745-6215-14-38