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Lawrence A, Lewis L, Hofmeyr GJ, Styles C: Maternal positions and mobility during first stage labour. Cochrane Database Syst Rev (8):CD003934, 2013. Lawrence, Annemarie; Lewis, Lucy; Hofmeyr, G Justus; Styles, Cathy (2013). „Maternal positions and mobility during first stage labour”. Ур.: Lawrence, Annemarie. Cochrane Database of Systematic Reviews. стр. CD003934. PMID23959763. S2CID31930945. doi:10.1002/14651858.CD003934.pub3.