1. Simula Research Laboratory; P.O. Box 134 1325 Lysaker Norway
2. Department of Informatics; University of Oslo; P.O. Box 1080, Blindern 0316 Oslo Norway
3. Center for Cardiological Innovation; Songsvannsveien 9, 0372 Oslo Norway
4. Faculty of Medicine; University of Oslo; P.O. Box 1078 Blindern, 0316 Oslo Norway
5. Department of Pediatrics; Oslo University Hospital; PO Nydalen Oslo Norway
6. Department of Mathematics; University of Oslo; P.O Box 1053, Blindern 0316 Oslo Norway
7. Department of Mathematical Science and Technology; Norwegian University of Life Sciences; Universitetstunet 3 1430 Ås Norway