Evaluating the efficacy of the HITSystem 2.1 to improve PMTCT retention and maternal viral suppression in Kenya: Study protocol of a cluster-randomized trial. - Mokua, Sharon; Maloba, May; Wexler, Catherine; Goggin, Kathy; Staggs, Vincent; Mabachi, Natabhona; Maosa, Nicodemus; Babu, Shadrack; Hurley, Emily; Finocchario-Kessler, Sarah (PLoS ONE, 2022)