Stress native T1 and native T2 mapping compared to myocardial perfusion reserve in long-term follow-up of severe Covid-19 oleh Jannike Nickander, Rebecka Steffen Johansson, Klara Lodin, Anton Wahrby, Daniel Loewenstein, Judith Bruchfeld, Michael Runold, Hui Xue, Peter Kellman, Henrik Engblom