The Heater–Cooler Unit—A Conceivable Source of Infection H.H. Weitkemper, A. Spilker, H.J. Knobl and R. Körfer J Extra Corpor Technol, 34 4 (2002) 276-280 Published online: 11 August 2023 DOI: 10.1051/ject/2002344276