المؤلفون: Noyes, R.W., Clewe, T.H., Bonney, W.A., Burrus, S.B., De Feo, V.J., Morgenstern, L.L.

المصدر: American Journal of Obstetrics and Gynecology; September 1966, Vol. 96 Issue: 2 p157-167, 11p