المؤلفون: Singh, S., Elit, L., Carey, M., Julian, J.A., Math, M, Dal Bello, D., Levine, M.

المصدر: Journal of Obstetrics and Gynaecology Canada; October 2001, Vol. 23 Issue: 10 p931-935, 5p

المؤلفون: Elit, L., Rosen, B., Anderson, G., Thiruchelvam, D.

المصدر: Journal of Obstetrics and Gynaecology Canada; May 2001, Vol. 23 Issue: 5 p390-396, 7p