[1] Univ Autonoma Madrid, Dept Cardiothorac Surg, Hosp Puerta Hierro, E-28035 Madrid, Spain
[2] Univ Autonoma Madrid, Dept Cardiol, Hosp Puerta Hierro, E-28035 Madrid, Spain
[3] Univ Autonoma Madrid, Dept Microbiol, Hosp Puerta Hierro, E-28035 Madrid, Spain