Emmanuel Chanda, Janet Hemingway, Immo Kleinschmidt, Andrea M. Rehman, Varsha Ramdeen, Faustina N. Phiri, Sarel Coetzer, David Mthembu, Cecilia J. Shinondo, Elizabeth Chizema-Kawesha, Mulakwa Kamuliwo, Victor Mukonka, Kumar S. Baboo, Michael Coleman
PLoS One. 2011; 6(9): e24336. Published online 2011 September 6. doi: 10.1371/journal.pone.0024336