[1] Univ Groningen, Univ Med Ctr Groningen, Dept Cardiol, NL-9700 RB Groningen, Netherlands
[2] Univ Groningen, Univ Med Ctr Groningen, Dept Epidemiol, NL-9700 RB Groningen, Netherlands
[3] Ist Ric Farmacol Mario Negri, Dept Cardiovasc Res, Milan, Italy
[4] ANMCO Res Ctr, Florence, Italy
[5] Fdn Salvatore Maugeri, Pavia, Italy
[6] Osped San Luigi Gonzaga, Orbassano, Italy
[7] Spedali Infermi Santa Maria Misericordia, Cortona, Italy
[8] Consorzio Mario Negri Sud, Santa Maria Imbaro, Italy