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Sittlington N, Tubman R, Halliday HL.Sittlington N, et al. Among authors: halliday hl.Midwifery. 1991 Mar;7(1):20-4. doi: 10.1016/s0266-6138(05)80130-5.Midwifery. 1991.PMID: 2011088Clinical Trial.