1. Department of Molecular and Clinical Medicine; Institute of Medicine; University of Gothenburg; Gothenburg Sweden
2. Department of Medicine; NU-Hospital Organization; Uddevalla Sweden
3. Centre of Registers in the Västra Götaland Region; Gothenburg Sweden
4. Saint Luke's Mid America Heart Institute; University of Missouri-Kansas City School of Medicine; MO USA
5. Statistiska Konsultgruppen; Gothenburg Sweden
6. University of Missouri-Kansas City School of Medicine and Children's Mercy Hospital; Kansas City MO USA
7. University of Kansas School of Medicine; Kansas City MO USA