Links[1] https://www.ctsnet.org/user/login?destination=user/473543 [2] https://www.ctsnet.org/print/home/mzellinger [3] https://www.ctsnet.org/article/protocol-cardiac-surgery-transfusion-triggers [4] https://www.ctsnet.org/articles/mzellinger [5] https://www.ctsnet.org/society/ctsnet