<qa>  What is the name of the two birth control methods?- Women of childbearing potential must have a negative serum pregnancy test prior to study entry; women of childbearing potential and men must agree to use two birth control methods either two barrier methods or a barrier method plus a hormonal method or abstinence prior to study entry and for the duration of study participation through at least 30 days after the last study injection; should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately 