Health worker acceptability of an HIV testing mobile health application within a rural Zambian HIV treatment programme - Andrés Montaner; Mulundu Mumbalanga; Marie-Chantal Umuhoza; Constance Wose Kinge; Emeka Okonji; Godfrey Ligenda; Eula Mothibi; Ben Chirwa; Pedro Pisa; Charles Chasela (PLoS ONE)