A systematic review of massive transfusion protocol in obstetrics oleh Hiroaki Tanaka, Shigetaka Matsunaga, Tomoyuki Yamashita, Toshiyuki Okutomi, Atsushi Sakurai, Akihiko Sekizawa, Junichi Hasegawa, Katsuo Terui, Yasutaka Miyake, Jun Murotsuki, Tomoaki Ikeda