Retracted Article: Management of Spontaneous Labor in Primigravidae: Labor Scale versus WHO Partograph (SLiP Trial) Randomized Controlled Trial - Tolba, Sara M.; Ali, Shymaa S.; Mohammed, Abdelrahman M.; Michael, Armia K.; Abbas, Ahmed M.; Nassr, Ahmed A.; Shazly, Sherif A. (American Journal of Perinatology, 2018)