00338nam a2200133Ia 4500008004100000020001800041041000800059082001000067100001600077245005500093250001100148260002900159650001600188260624s2019    xx            000 0 und d  a9788131247006  aeng  a618.2  aNorton Mary  aCallens Ultrasonography in Obstetrics & Gynecology  a1st ed  bElsevier, Pub.2019c2019  aObst &Gynac