1. Heart Failure Unit; Hospital Universitari Germans Trias i Pujol; Badalona Spain
2. Department of Medicine; Autonomous University of Barcelona; Barcelona Spain
3. CIBERCV; Instituto de Salud Carlos III; Madrid Spain
4. Institute of Cardiovascular and Medical Sciences; University of Glasgow; Glasgow UK
5. IMIM (Hospital del Mar Research Institute); Barcelona Spain
6. CIBER Epidemiology and Public Health; Barcelona Spain
7. Biochemistry Service; Hospital Universitari Germans Trias i Pujol; Badalona Spain