<qa>  What is the contraception method for women of child-bearing potential?- Women of child-bearing potential and men must agree to use adequate contraception hormonal or barrier method of birth control; abstinence prior to study entry and for the duration of study participation; women of child-bearing potential must have a negative pregnancy test prior to study entry; should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately 