2. Women of child-bearing potential must practice an acceptable method of birth control [acceptable methods of birth control in this open label extension phase include: surgical sterilization, intrauterine devices, oral contraceptive, contraceptive patch (or hormone-releasing vaginal ring), long-acting injectable contraceptive, partner's vasectomy or double-barrier method (condom or diaphragm with spermicide)] during the study and up to 30 days after the last dose of the study drug..