2. Females of reproductive age who have not used or do not plan to use acceptable birth control measures, for the 3 months duration of the study. Oral, injected or implanted hormonal contraceptive, diaphragm, condom, intrauterine device or sexual abstinence are considered acceptable forms of birth control. If sexually active the subject must have been using one of the accepted birth control methods for at least 60 days prior to study entry;