说明
Andrews, W. W., Goldenberg, R. L., Mercer, B., Iams, J., Meis, P., Moawad, A., Das, A., Vandorsten, J. P., Caritis, S. N., Thurnau, G., Miodovnik, M., Roberts, J. & McNellis, D. The Preterm Prediction Study: association of second-trimester genitourinary chlamydia infection with subsequent spontaneous preterm birth. Am J Obstet Gynecol 183, 662-668 (2000).