- Predictive values, relative risks, and overall benefits of high and low maternal serum alpha-fetoprotein screening in singleton pregnancies: new epidemiologic data. Milunsky, A., Jick, S.S., Bruell, C.L., MacLaughlin, D.S., Tsung, Y.K., Jick, H., Rothman, K.J., Willett, W. Am. J. Obstet. Gynecol. (1989)