 - Pregnancy, possible pregnancy or breast-feeding - women of child-bearing potential or breastfeeding mothers cannot participate. A woman is considered of childbearing potential following menarche and until becoming post-menopausal unless permanently sterile. Permanent sterilisation methods include hysterectomy, bilateral salpingectomy and bilateral oophorectomy. A postmenopausal state is defined as no menses for 12 months without an alternative medical cause. 