Current trends in obstetric epidural practice.
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Hough
D000388:Air; D000767:Anesthesia, Epidural / Q000379:methods* / Q000639:trends; D000773:Anesthesia, Obstetrical / Q000379:methods* / Q000639:trends; D005260:Female; D006801:Humans; D011247:Pregnancy; D012965:Sodium Chloride
D012965:Sodium Chloride