American College of Obstetricians and Gynecologists

American Society for Reproductive Medicine

Centers for Disease Control and Prevention (United States)

Government of Canada

JAMA Collection for Patients (United States)

Mayo Clinic (United States)

Medline Plus (United States)

National Institute of Child Health and Human Development (United States)

National Women’s Health Resource Center (United States)

Society of Obstetricians and Gynaecologists of Canada

UpToDate for Patients (United States)

Page Last Updated: August 7, 2018
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