As many as 12 cases with haemorrhagic acquired factor XIII deficiency due to its inhibitors were recently found in Japan

1 A list of groupup members is given in the Appendix. 2 happening frequently in clinical scenes, even in the official journal of the International Society of Thrombosis and Hemostasis as well as in PubMed. 3 detailed characterisation of their antibodies will be reported elsewhere in the future.