[1] Univ Europea Madrid, Hosp Quiron Madrid, Serv Cardiol, Madrid 28223, Spain
[2] Univ London Imperial Coll Sci Technol & Med, Natl Heart & Lung Inst, London SW7 2AZ, England
[3] Royal Brompton & Harefield NHS Trust, London, England
[4] Univ Extremadura, Fac Med, Dept Anat & Biol Celular, Badajoz, Spain