Prevalence of malaria in pregnancy in southern Laos: a cross-sectional survey. by Briand, V, Le Hesran, J, Mayxay, M, Newton, P, Bertin, G, Houzé, S, Keomany, S, Inthavong, Y, Vannavong, N, Chindavongsa, K, Hongvanthong, B, Fievet, N