Increased blood loss in upright birthing positions originates from perineal laceration.
Suzuki
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D000328:Adult; D036861:Delivery, Obstetric / Q000379:methods*; D005260:Female; D006801:Humans; D010502:Perineum / Q000293:injuries*; D006473:Postpartum Hemorrhage / Q000209:etiology*; D011187:Posture; D011247:Pregnancy