[1] Autonomous Univ Madrid, Fdn Jimenez Diaz Sch Nursing, Avda Reyes Catolicos, Madrid 28040, Spain
[2] Ramon Y Cajal Univ Hosp, Cardiol Dept, Madrid, Spain
[3] Univ Alcala, Dept Biol Syst Physiol, Alcala De Henares, Spain
[4] Fdn Jimenez Diaz Univ Hosp, Madrid, Spain
[5] Colegio Oficial Enfermeria Madrid CODEM, Madrid, Spain