Le thi Thanh Xuan*, Luu N Hoat, Thilde Rheinländer, Anders Dalsgaard and Flemming Konradsen
* Corresponding author: Le thi Thanh Xuan lethithanhxuan@hmu.edu.vn
BMC Public Health 2012, 12:140 doi:10.1186/1471-2458-12-140