1. Department of Learning, Informatics, Information and Ethics, Karolinska Institutet, Stockholm Sweden and European Health Economics, SE-11120 Stockholm, Sweden,
2. Institute of Clinical Neurology, University of Sassari, I-07100 Sassari, Italy
3. Eulerweg 4, D-64379 Griesheim, Germany
4. Lund University, Sweden and European Health Economics France, F-06530 Spéracedes, France