pregnancy bleeding hemorrhage femoral anatomy anatomy lockwood strangulation inguinal hernia inguinal femoral canal femoral sheath femoral ring femoral triangle femoral femoral hernia hernia stages fetus fetal head obstetrics female pelvis complication labour contracted pelvis cpd cephalopelvic disproportion woman pregnant antipartum accidental abruptio abruption placenta disease hematological neonatal disorders anemia hematology neonates
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