Phase 1 randomized pharmacokinetic and safety study of a 90-day tenofovir vaginal ring in the United States.

Liu AY, Gundacker H, Richardson B, Chen BA, Hoesley C, van der Straten A, Brown A, Beamer M, Robinson J, Jacobson CE, Scheckter R, Bunge K, Schwartz J, Thurman A, Piper JM, Marzinke MA; MTN-038 Protocol Team for the Microbicide Trials Network.