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Univ Texas Med Branch Galveston, Div Hlth Policy & Hlth Serv Res, Dept Obstet & Gynecol, Galveston, TX 77555 USA Univ Texas Med Branch Galveston, Div Hlth Policy & Hlth Serv Res, Dept Obstet & Gynecol, Galveston, TX 77555 USA