The maternity back-stroke.
D001416:Back Pain / Q000628:therapy; D004599:Electric Stimulation Therapy / Q000379:methods*; D005260:Female; D006801:Humans; D007747:Labor Stage, First; D007743:Labor, Obstetric; D059408:Pain Management; D011247:Pregnancy; D012445:Sacrococcygeal Region / Q000294:innervation