Two-way mobile phone intervention compared with standard-of-care adherence support after second-line antiretroviral therapy failure: a multinational, randomised controlled trial oleh Robert Gross, MD MSCE, Justin Ritz, MS, Michael D Hughes, ProfPhD, Robert Salata, ProfMD, Peter Mugyenyi, ProfFRCPE, Evelyn Hogg, BA, Linda Wieclaw, BA, Catherine Godfrey, MD, Carole L Wallis, PhD, John W Mellors, ProfMD, Victor O Mudhune, MPH, Sharlaa Badal-Faesen, MBBCh, Beatriz Grinsztejn, ProfMD, Ann C Collier, ProfMD