- Pregnancy or intention of becoming pregnant within the study duration (Women of childbearing potential participating in the study must have a negative serum pregnancy test result at screening and use a medically acceptable form of contraception. Medically acceptable forms of contraception include oral contraceptives, injectable or implantable methods, intrauterine devices, or properly used double-barrier contraception, eg condom plus diaphragm. If screening pregnancy test is done greater than 7 days before implant, women of childbearing potential must have another serum pregnancy test result before implantation. Any woman becoming pregnant during the treatment period must withdraw from the study)