Efficacy of intravenous tranexamic acid in reducing blood loss after elective cesarean section: a prospective, randomized, double-blind, placebo-controlled study - Gungorduk, K; Yıldırım, G; Asıcıoğlu, O; Gungorduk, O C; Sudolmus, S; Ark, C (Am J Perinatol, 2011)