1. Department of Biostatistics, Oslo Centre for Biostatistics and Epidemiology, University of Oslo, Domus Medica Gaustad, Sognsvannsveien 9, Oslo, Norway
2. Department of Medicine, Diakonhjemmet Hospital, Diakonveien 12, Oslo, Norway
3. Institute for Surgical Research, Oslo University Hospital and University of Oslo, Nydalen, Oslo, Norway
4. Department of Cardiology and Center for Cardiological Innovation, Oslo University Hospital, Rikshospitalet, Nydalen, Oslo, Norway
5. Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital, Sogn Arena 3.etg, Pb 4950 Nydalen, Oslo, Norway