Kim D, Canh DG, Poulos C, Thoa LTK, Cook J, Hoa NT, Nyamete A, Thuy DTD, Deen J, Clemens J, Thiem VD, Anh DD, Whittington D. Private demand for cholera vaccines in Hue,Vietnam. Value Health. 2008 Jan 1;11(1):119-28.