Monitoring the scale-up of antiretroviral therapy programmes: methods to estimate coverage.
Boerma JT, Stanecki KA, Newell ML, Luo C, Beusenberg M, Garnett GP, Little K, Calleja JG, Crowley S, Kim JY, et al. Bull World Health Organ. 2006 Feb; 84(2):145-50. Epub 2006 Feb 23.