[1] UCM, Hosp Gen Univ Gregorio Maranon, Fac Med, Inst Invest Sanitaria Gregorio Maranon IiSGM,Resp, Madrid, Spain
[2] Rey Juan Carlos Univ, Hlth Sci Fac, Prevent Med & Publ Hlth Teaching & Res Unit, Madrid, Spain
[3] Hosp Univ Clin San Carlos, Internal Med Dept, Madrid, Spain
[4] Univ Gregorio Maranon, Gen Hosp, Internal Med Dept, Madrid, Spain