Calvin WL Chin, Elian HS Chia, Stefan Ma, Derrick Heng, Maudrene Tan, Jeanette Lee, E Shyong Tai and Agus Salim*
* Corresponding author: Agus Salim ephaguss@nus.edu.sg
BMC Medical Research Methodology 2012, 12:48 doi:10.1186/1471-2288-12-48