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Am J Obstet Gynecol. 1990 May;162(5):1150-3. doi: 10.1016/0002-9378(90)90004-q.
Early signs and symptoms of preterm labor.
Katz M, Goodyear K, Creasy RK
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Am J Obstet Gynecol. 1990 May;162(5):1150-3. doi: 10.1016/0002-9378(90)90004-q.
Katz M, Goodyear K, Creasy RK