AT and PT conceived the experimental proposal, participated in its design and coordination and contributed to write the manuscript.
EVN and RTS conceived the original proposal and strategy to develop research capacity and are co-directors of the programme and responsible for the overall implementation.
AAD conceived the idea, drafted the proposal and involved in all implementation stages of the project and write up; AB reviewed the proposal, and involved in all implementation stages of the project and write up.
AT conceived the idea, drafted the proposal and involved in all implementation stages of the project and write up.
WA, ME and FM: conceived the idea, write the proposal, processes clinical samples, data analysis and draft the manuscript for publication.
Michael Aloyce Munga conceived the idea, prepared the proposal and submitted it for funding, participated in data collection and analysis and had the sole responsibility of preparing the first drafts of this paper.
WJ, XL, SR and BY conceived of the proposal of the study, conducted the study and drafted the manuscript.
WZ, LL, XL and SR conceived of the proposal of the study, conducted the study and drafted the manuscript.
A.A.D conceived the original idea, drafted the proposal, involved in all implementation stages of the project, and write up; A.B reviewed the proposal and involved in all implementation stages of the project and write up.
TB conceived the initial idea, developed the proposal, collected data, did the analysis and write up.
