By,  Gary Null, PhD, Debora Rasio, MD, and Martin Feldman, MD   With the third installment of this series, we conclude our examination of conventional medical practices and women’s health. Part 3 looks at problems associated with the use of oral contraceptives; Parts 1 and 2 covered topics relating to pregnancy, childbirth, breast-feeding, hysterectomies, cesarean sections, and episiotomies. As established …