8[2]Gao Ji, Ma Li-yuan, Zeng Su, et al. MBL in healthy Chinese women. Contraception, 1981, 23(6):591~601.
9[4]Hallberg L, Hdahl AM, Nilsson L, et al. MBL-A population study,variation at different ages and attempts to define normality. Acta Obstetet Gynecol Scand, 1966, 45(3):325~45.
10[5]Cole SK, Billewicz WZ. sources of variation in MBL. J Obstet Gynecol Brit Commonw, 1971, 78(10):933~9.