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Mirzakhani, Kobra and Hejazinia, Zahra and Golmakani, Nahid and Mirteimouri, Masoumeh and Ali Sardar, Mohammad and Tghi Shakeri, Mohammad (2015) The effect of exercise with special ball during pregnancy on duration of active phase of first stage of birth in nulliparous women. The Iranian Journal of Obstetrics, Gynecology and Infertility, 18 (174). pp. 12-21.