Khan MH, Akazawa M, Dararath E, Kiet HB, Sovannarith T, Nivanna N, Yoshida N, Kimura K. Perceptions and practices of pharmaceutical wholesalers surrounding counterfeit medicines in a developing country: a baseline survey. BMC Health Services Research. 2011 Nov 11;11(1):306. doi: 10.1186/1472-6963-11-306.