- For female participants: Pregnancy or breast feeding; or, intention to become pregnant during the course of the experiment; or, lack of safe contraception (defined as: female participants of childbearing potential, not using a medically reliable method of contraception, such as oral, injectable, or implantable contraceptives, or intrauterine contraceptive devices, or who are not using any other method considered sufficiently reliable by the investigator in individual cases). A pregnancy test will be provided for participants of ages 14 and older