1. HerzGefässZentrum, Klinik Im Park, Zürich, Switzerland.
2. AMIS Plus Data Center, Institute of Social and Preventive Medicine, Zürich University, Switzerland.
3. Division of Cardiology, Kantonsspital, St.Gallen, Switzerland.
4. Division of Cardiology, Luzerner Kantonsspital, Switzerland.
5. Biostatistics Unit, Institute of Social and Preventive Medicine, Zürich University, Switzerland.
6. Division of Cardiology, Cardiocentro Ticino, Lugano, Switzerland.
7. Cardiovascular Department, Hopital de la Tour, Switzerland.