Authors’ contributions
LCK
This article was designed collaboratively by LCK, DLJ, CKB, CLP, LLM and KFN at two writing workshops in Malawi and all contributed significantly to the intellectual content of the manuscript. LCK took primary responsibility for drafting the manuscript, and the other co-investigators made substantive contributions to the draft. DLJ, the Malawi Multiple Principal Investigator (MPI), also provided project oversight of data collection and data integrity. KFN, the US MPI, co-led drafting and revising of the manuscript. LL, the study biostatistician, designed and oversaw statistical analysis and drafted the methods and results sections. CC carried out the analysis and developed and helped interpret the tables and figures. All authors read and approved the final manuscript.