9Ahn Yonn-Ok, Yoo Keun-Young, Park Byung-Joo. An epi demiological study of risk factors of hepatitis B infection in Korea[J]. Korean Journal of Epidemiology , 1987,9(1): 57 ~65.
10Erie E Mast, Frank J Mahoney, Miriam J Alter ,et al. Progress to-ward elimination of Hepatitis B in the European region [ J ]. Vac-cines, 1998 ,16( 1 ) :48-51.