Borowiec , J., Thelin , S., Bagge , L., van der Linden , J., Thörnö , E., & Hansson , H.-E. (1992). Heparin-coated cardiopulmonary bypass circuits and 25% reduction of heparin dose in coronary artery surgery—a clinical study. Upsala Journal of Medical Sciences, 97(1), 55-66. https://doi.org/10.3109/03009739209179282