00359nam a2200109Ia 4500008004100000040001100041100001800052245010400070260004900174300001600223300001000239251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aJohn M. Grant 0aBritish Journal of Obstetrics & GynaecologybAn International Journal of Obstetrics and Gynaecology  cMay 14, 1980bElsevier Science LtdaNew York  aP. 941-1912  bV. 94