Adolescent and Young Adult Experiences With Turner Syndrome: The purpose of this study is to describe the experiences of 16- to 26-year-olds with Turner syndrome

NOMAC-E2 (MK-8175A) Birth Control Pill Study: The purpose of this study is to test the research study drug NOMAC-E2 (MK-8175A) oral tablets with respect to the effectiveness in preventing pregnancy, the regulation of your menstrual cycle and the safety in terms of side effects.

Pre-Menopausal Heavy Uterine Bleeding and Uterine Fibroids Study: The purpose of this study is to determine the efficacy of an oral investigational medication to decrease frequency and amount of uterine bleeding as well as size or volume of uterine fibroids.

Risk Factors for Women with Cerebral Aneurysm Study: Our study will focus on better understanding why women appear to be at higher risk for the development of cerebral aneurysms.

Women with Endometriosis Severe Pain: The purpose of this study is to test the safety and effectiveness of different doses of a study medication compared to placebo (inactive substance) in managing moderate to severe pain associated with endometriosis.