Adherence to recommendations for ART and targeted PrEP use among HIV serodiscordant couples in East Africa: the “PrEP as a bridge to ART” strategy oleh Nicholas Musinguzi, Lara Kidoguchi, Nelly R. Mugo, Kenneth Ngure, Elly Katabira, Connie L. Celum, Jared M. Baeten, Renee Heffron, Jessica E. Haberer, on behalf of the Partners Demonstration Project Team