Sibanda, EL; Weller, IVD; Hakim, JG; Cowan, FM; (2013) The magnitude of loss to follow-up of HIV-exposed infants along the prevention of mother-to-child HIV transmission continuum of care: a systematic review and meta-analysis. AIDS , 27 (17) 2787 - 2797. 10.1097/QAD.0000000000000027.