1. Hepatitis B Virus Infection in Infants and Children in Japan
2. 2. Maternal and Child Health Division, Children and Family Bureau, Ministry of Health and Welfare ed: Statistics Relating to Maternal and Child Health in Japan. Tokyo, 1987, Mother's and Children's Health and Welfare Association, p.62 .
3. 3. The same to 2, p.48 .
4. 4. T Oda, and S. Iino The results of inquiry about prevention of mother-to-infant infection. Annual report on the researches on hepatitis granted by Ministry of Health and Welfare in 1984. 1985 : 152 -154 (in Jpn).