Randomized clinical trial of metronidazole plus erythromycin to prevent spontaneous preterm delivery in fetal fibronectin-positive women

William W. Andrews, Baha M. Sibai, Elizabeth A. Thom, Donald Dudley, J. M. Ernest, Donald McNellis, Kenneth J. Leveno, Ronald Wapner, Atef Moawad, Mary J. O'Sullivan, Steve N. Caritis, Jay D. Iams, Oded Langer, Menachem Miodovnik, Mitchell Dombrowski