Seroreduction of syphilis non-treponemal titers during pregnancy for women with and without HIV co-infection. - Webster CM; Kasaro MP; Price JT; Stringer EM; Wiesen CA; Vwalika B; Stringer JSA (International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics, 2022)