Acknowledgements
RS
The authors thank the study participants for their time and contributions in the A5331 and MWCCS sites. We thank E Turner Overton for help with the study design. We also thank Jonathan Kerman, Jennifer Cohen, Eryka Wentz, Gayle Springer and MWCCS Data Analysis and Coordinating Center for all their help with participant and sample selection. This research was supported by a sub-award (ACTG NWCS 448) to RS from the Supplementary data related to this article can be found at 