COVID-19(4) still hospitalized(2) Care(2) Immunosuppressed(2) SARS-CoV-2(2) Mortality(2) subject(2) outcome(2) Italian(2) died(2) Clinical course(2) stimulate(2) male(2) patients died(2) Follow-up(2) Analysis(2) Treatment(2) COVID-19 and heart transplant recipients(2) therapy(2) Infection(2) positive(2) tested(2) Prevalence(2) functional(2) heart(2) arteriopathy(2) Heart transplantation(2) landscape(2) patients(2) immunosuppressive(2)