- girls of child bearing potential (Tanner scale >3) OR all girls 8 years of age and older have a negative urine pregnancy test at screening, must be using a medically acceptable method of birth control, and must agree to continue use of this method for the duration of the study (and for 30 days after participation in the study). (NOTE: For conducting pregnancy tests, the investigator has the option of determining the sexual maturity all girls 8 years of age and older.) Acceptable methods of birth control include: barrier method with spermicide; steroidal contraceptive (eg, oral, transdermal, implanted, and injected) in conjunction with a barrier method; intrauterine device (IUD); or abstinence