[1] Hosp Clin San Carlos, Inst Invest Sanitaria San Carlos, Madrid, Spain
[2] Univ Complutense Madrid, Hosp Clin San Carlos, Inst Invest Sanitaria San Carlos, Fac Med, Madrid, Spain
[3] Univ Complutense Madrid, Inst Invest Sanitaria, Fac Enfermeria Fisioterapia & Podol, Avda Complutense s-n, Madrid 28040, Spain
[4] Hosp Clin San Carlos, Inst Invest Sanitaria San Carlos, Inst Salud Carlos 3, Red Invest Cron Atenc Primaria & Prevenc & Promoc, Madrid, Spain
[5] Hosp Clin San Carlos, Madrid, Spain
[6] Hosp Ramon & Cajal, Madrid, Spain
[7] Hosp Doce Octubre, Madrid, Spain
[8] Hosp La Paz, Madrid, Spain
[9] Hosp Gregorio Maranon, Madrid, Spain
[10] Univ Complutense Madrid, Inst Invest Sanitaria San Carlos, Fac Enfermeria Fisioterapia & Podol, Avda Complutense s-n, Madrid 28040, Spain