Plasmodium falciparum antimalarial drug susceptibility on the north-western border of Thailand during five years of extensive use of artesunate-mefloquine. by Brockman, A, Price, R, van Vugt, M, Heppner, D, Walsh, D, Sookto, P, Wimonwattrawatee, T, Looareesuwan, S, White, N, Nosten, F