Author contributions
RECRUITMENT
AB, SJ, SD, WW, WA, and BB conceived the study and designed the overall protocol. SER, PN, MM, and BC supervised data acquisition at recruitment sites and contributed to site specific protocol design. MAH and MC acquired study data and supervised others in acquiring study data. SD led designed the statistical plan. All authors contributed to the drafting and/or revising of the manuscript. All authors read and approved the final manuscript.