6Li L, Sheng MH, Tong SP, et al. Transplacental transmission of hepatitis B virus. Lancet, 1986,2 ( 8511 ) : 872.
7Lin HH,Lee TY,Chen DS,et al. Transplacental leakage of HBeAg -positive maternal blood as the most likely route in causing intrauterine infection with hepatitis B virus. J Pediatr, 1987,111 (6 pt1):877.
8Chen WH, Yin CS,Chang YK,et al. Neonatal gastric aspirates as a predictor of perinatal hepatitis B virus infections. Int J Gynaecol Obstet, 1998,60( 1 ) : 15.