The effect of intrapartum fetal pulse oximetry, in the presence of a nonreassuring fetal heart rate pattern, on operative delivery rates: a multicenter, randomized, controlled trial (the FOREMOST trial) - East,C.E.; Brennecke,S.P.; King,J.F.; Chan,F.Y.; Colditz,P.B. (Am J Obstet Gynecol, 2006)