No evidence for spread of Plasmodium falciparum artemisinin resistance to Savannakhet Province, Southern Laos. - Mayxay, M; Khanthavong, M; Chanthongthip, O; Imwong, M; Lee, S; Stepniewska, K; Soonthornsata, B; Pongvongsa, T; Phompida, S; Hongvanthong, B; Ringwald, P; White, N; et al. (American journal of tropical medicine and hygiene, 2012)