00286pam a2200109 a 4500020002000000041000500020082002000025100001900045245007600064260002600140300001000166  a9788131247006c  h  a618.047543bNOR  aNorton Mary E.  aCallens ultrasonography in Obstetrics and GynecologyhTextual Documents  bElsevier,  Pub.c2016  a1252.