Authors: 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 Journal: PLoS One Date: 2011-09-06 Impact factor: 3.240