[1] Univ Parma, Azienda Osped, Unita Operat Cardiol, Div Cardiol, I-43100 Parma, Italy
[2] Ctr Math Sci, Stat Lab, Cambridge, England
[3] Azienda Osped Niguarda Ca Granda, Div Cardiol, Milan, Italy
[4] Univ Milan, Osped Maggiore Mangiagalli & Regina Elena, Fdn Ist Ricovero & Cura Carattere Sci, Dept Internal Med & Med Specialties, Milan, Italy
[5] Massachusetts Gen Hosp, Div Cardiol, Boston, MA 02114 USA
[6] Broad Inst Massachusetts Inst Technol & Harvard U, Program Med & Populat Genet, Cambridge, MA USA
[7] Massachusetts Gen Hosp, Ctr Human Genet Res, Boston, MA 02114 USA
[8] Massachusetts Gen Hosp, Dept Mol Biol, Boston, MA 02114 USA
[9] Osped San Filippo Neri, Div Cardiol, Rome, Italy
[10] Osped San Camillo, Div Cardiol, Rome, Italy
[11] Policlin San Matteo, Fdn Ist Ricovero Cura & Carattere Sci, I-27100 Pavia, Italy
[12] Univ Vita Salute San Raffaele, Milan, Italy
[13] Ist Sci San Raffaele, I-20132 Milan, Italy
[14] Osped Livorno, Div Cardiol, Livorno, Italy
[15] Univ Verona, Osped Borgo Trento, Div Cardiol, I-37100 Verona, Italy
[16] Ist Clin Humanitas, Ist Ricovero Cura & Carattere Sci, Div Cardiol, Milan, Italy
[17] Univ Ferrara, Dept Biochem & Mol Biol, I-44100 Ferrara, Italy
[18] Osped Rovigo, Div Cardiol, Rovigo, Italy
[19] Univ Turin, Dept Genet Biol & Biochem, Turin, Italy
[20] Univ Pavia, Dept Appl Hlth Sci, I-27100 Pavia, Italy
[21] MRC, Biostat Unit, Cambridge CB2 2BW, England
[22] Harvard Univ, Sch Med, Dept Med, Boston, MA USA
[23] Harvard Univ, Sch Med, Dept Genet, Boston, MA USA