1 ASST Spedali Civili di Brescia, Brescia, Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, University of Brescia, Brescia, Italy.
2 Scottish National Advanced Heart Failure Service, Golden Jubilee National Hospital, Clydebank, Glasgow, UK.
3 Cardiology Department, King's College Hospital, Denmark Hill, London, UK.