Increased interleukin-6 concentrations in cervical secretions are associated with preterm delivery. - Lockwood, ,C. .J., .; Ghidini, ,A. .; Wein, ,R. .; Lapinski, ,R. .; Casal, ,D. .; Berkowitz,R. .L. . (Amer. J. Obstet. Gynecol., 1994)