Clemens JD, Sack DA, Harris JR, Van Loon F, Chakraborty J, Ahmed F, Rao MR, Khan MR, Yunus M, Huda N, et al. Field trial of oral cholera vaccines in Bangladesh: results from three-year follow-up. Lancet. 1990 Feb 3;335(8684):270-3.
Clemens JD, Sack DA, Harris JR, Van Loon F, Chakraborty J, Ahmed F, Rao MR, Khan MR, Yunus M, Huda N, et al. Field trial of oral cholera vaccines in Bangladesh: results from three-year follow-up. Lancet. 1990 Feb 3;335(8684):270-3.