Preterm labor is induced by intraamniotic infusions of interleukin-1β and tumor necrosis factor-α but not by interleukin-6 or interleukin-8 in a non human primate model - Sadowsky,D.W.; Adams,K.M.; Gravett,M.G.; Witkin,S.S.; Novy,M.J. (Am J Obstet Gynecol, 2006)