004740000a22001570004500003000900000005001700009562002100026110004400047245008600091264004900177300000900226041000800235650004400243650001800287040001100305PH-MaWHO20241108112537.0  aWHO/EPI/GEN/90.6  aWHO Expanded Programme on Immunization.  aProtocol for assessing prevalence of hepatitis B infection in antenatal patients.  aGeneva : bWorld Health Organization,c1990.  a12p.  aeng  aHepatitis BxEpidemiologyxIn pregnancy  aPrenatal care  aWHOLIS