Cardiac fibroblast activation detected by 68Gallium-FAPI-46 positron emission tomography–magnetic resonance imaging as a sign of chronic activity in cardiac sarcoidosis. Issue 1 (9th January 2022) - Siebermair, Johannes; Kessler, Lukas; Kupusovic, Jana; Rassaf, Tienush; Rischpler, Christoph