Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) BOTHA JF,Hepatitis B virus carrier state in black children in Ovamboland : role of perinatal and horizontal infection,Lancet,,,1984,1,,1210-1212,https://cir.nii.ac.jp/crid/1570291226236631680,https://doi.org/10.1016/s0140-6736(84)91694-5