Effect of an interactive text-messaging service on patient retention during the first year of HIV care in Kenya (WelTel Retain): an open-label, randomised parallel-group study by Mia Liisa van der Kop, MSc, Samuel Muhula, MSc, Patrick I Nagide, MSc, Prof Lehana Thabane, PhD, Lawrence Gelmon, MD, Patricia Opondo Awiti, PhD, Bonface Abunah, MSc, Lennie Bazira Kyomuhangi, MD, Matthew A Budd, MSc, Prof Carlo Marra, PhD, Anik Patel, PhD, Sarah Karanja, MPH, David I Ojakaa, PhD, Edward J Mills, PhD, Prof Anna Mia Ekström, PhD, Richard Todd Lester, MD

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