[1
]
Division of Reproductive Health, National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA. Electronic
address: acreanga@cdc.gov.
[2
]
Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham
and Women's Hospital and Harvard Medical School, and Department of Anesthesiology,
Critical Care, and Pain Medicine, Massachusetts General Hospital, Harvard Medical
School, Boston, MA.
[3
]
Department of Anesthesiology, University of Michigan Health System, Ann Arbor, MI.
[4
]
Division of Heart Disease and Stroke Prevention, National Center for Chronic Disease
Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta,
GA.
[5
]
Department of Obstetrics and Gynecology, New York Medical College, Valhalla, NY.
[6
]
Division of Reproductive Health, National Center for Chronic Disease Prevention and
Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA.