Schils, J., Collard, E., Henkel, M., Eucher, P., & Joucken, K. (2000). Sudden hypotension after cardiopulmonary bypass. Journal of Cardiothoracic and Vascular Anesthesia, 14(1), 106-107. https://doi.org/10.1016/S1053-0770(00)90081-8 (Original work published 2000)