The impact of community-based participatory health systems interventions on prevention of mother-to-child transmission of HIV (PMTCT) in sub-Saharan Africa: a systematic review and meta-analysis protocol

社区参与式卫生系统干预措施对撒哈拉以南非洲预防艾滋病毒母婴传播（PMTCT）的影响：系统评价和荟萃分析方案