Ongubo DM, Lim R, Tweya H, Stanley CC, Tembo P, Broadhurst R, Gugsa S, Ngongondo M, Speight C, Heller T, Phiri S, Hosseinipour MC.BMC Infect Dis. 2017 Jul 3;17(1):461. doi: 10.1186/s12879-017-2528-0. PubMed PMID: 28673254; PubMed Central PMCID: PMC5496231.