1. Center for Medical Technology Assessment, Department of Health and Society, Linköping University, SE-581 83 Linköping, Sweden
2. Competence Center Non-invasive Medical Measurements, Department of Biomedical Engineering, Linköping University, SE-581 83 Linköping, Sweden
3. Department of Computer and Information Science (IDA), Linköping University, SE-581 83 Linköping, Sweden. E-mail: almhe@ida.liu.se