1. Implementation of a couple-based HIV prevention program: a cluster randomized trial comparing manual versus Web-based approaches Witte, Susan S.; Wu, Elwin; El-Bassel, Nabila; Hunt, Timothy; Gilbert, Louisa; Potocnik Medina, Katie; Chang, Mingway P.; Kelsey, Ryan; Rowe, Jessica C.; Remien, Robert H. 2014 Articles Medical sciences