Use of preoperative haemostasis and ABO blood typing tests in children: A retrospective observational study using a nationwide claims database in Japan

Hiroshi Yonekura, Kazuki Ide, Yuji Kanazawa, Chikashi Takeda, Yuki Nakamori, Yasunori Matsunari, Michihiro Sakai, Koji Kawakami, Masataka Kamei