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Univ Oxford, Oxford OX1 2JD, England
Univ Glasgow, Fac Med, Glasgow G12 8QQ, Lanark, Scotland
Univ Med & Dent New Jersey, Dept Obstet Gynecol & Reprod Sci, Newark, NJ 07103 USA
John Radcliffe Hosp, Maturitas Level Womens Ctr 4, Oxford OX3 9DU, England Univ Bristol, Acad Unit Primary Care, Bristol BS8 2AA, Avon, England