A randomised controlled trial of oxytocin 5IU and placebo infusion versus oxytocin 5IU and 30IU infusion for the control of blood loss at elective caesarean section—pilot study. ISRCTN 40302163 - Murphy, D J; MacGregor, H; Munishankar, B; McLeod, G (Eur J Obstet Gynecol Reprod Biol, 2009)