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UNIV NOTTINGHAM HOSP,QUEENS MED CTR,DEPT OBSTET & GYNAECOL,PERINATAL RES & MONITORING UNIT,NOTTINGHAM NG7 2UH,ENGLAND UNIV NOTTINGHAM HOSP,QUEENS MED CTR,DEPT OBSTET & GYNAECOL,PERINATAL RES & MONITORING UNIT,NOTTINGHAM NG7 2UH,ENGLAND