Oligomenorrhea

• Children's Mercy Hospital — Kansas City, Missouri, United States
• Cornell University - Human Metabolic Research Unit — Ithaca, New York, United States
• University of Rochester, Strong Fertility Center — Rochester, New York, United States

• Zhordania and Khomasuridze Institute of Reproductology — Tbilisi, Georgia
• Department of Obstetrics and Gynecology with Reproductive Medicine, F.I. Inozemtsev Academy of Medical Education — Saint Petersburg, Russian Federation, Russia

• Hospital Universitario Ramón y Cajal — Madrid, Spain

• Human Metabolic Research Unit, Cornell University — Ithaca, New York, United States

Not specified

• National Institutes of Health Clinical Center, 9000 Rockville Pike — Bethesda, Maryland, United States

Not specified