I Kuitunen1, M Kekki2, V Ponkilainen3, T Huttunen4. 1. Mikkeli Central Hospital, University of Eastern Finland, Mikkeli, Finland. 2. Tampere University Hospital, Tampere, Finland. 3. Central Finland Hospital Nova, Jyväskylä, Finland. 4. Tampere Heart Hospital, Tampere University Hospital, Tampere, Finland.