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Premature delivery is the single most important obstetrical complication associated with perinatal mortality and morbidity. An additional one or two weeks of intrauterine existence may decrease neonatal morbidity and mortality. The physiologic aspects of the onset of labor remain an enigma to modern medicine. The exact cause and mechanism of the inhibition of human parturition are unknown and many theories have been advanced to explain the onset of labor: oxytocin, alpha catecholamins,doi:10.18452/9967 fatcat:a7jaoe7bdvbmpckcn6zu6g6xm4