Declining HIV prevalence among young pregnant women in Lusaka, Zambia. - Stringer, Elizabeth M.; Chintu, Namwinga T.; Levy, Jens W.; Sinkala, Moses; Chi, Benjamin H.; Muyanga, Jubra; Bulterys, Marc; Bweupe, Maximilian; Megazzini, Karen; Stringer, Jeffrey S. A. (Bulletin of the World Health Organization, 2008)