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Van deer Kop ML, Ojakaa DI, Patel A, Thabane L, Kinagwi K, Ekstrom AM, Smillie K, Karanja S, Awiti P, Mills E, Marra C, Kyomuhangi LB, Lester RT. The effect of weekly short message service communication on patient retention in care in the first year after HIV diagnosis: Study protocol for a randomized controlled trial (WelTel Retain). BMJ Open. 2013 Jun 20;3(6). pii: e003155. doi: 10.1136/bmjopen-2013-003155. PMID: 23794578