1. RWTH Aachen University; Human Technology Research Center; Campus Boulevard 57 52074 Aachen Germany
2. Nankai University; College of Computer and Control Engineering; Tianjin 300071 P.R. China
3. UMIT - The Health & Life Sciences University; Department of Biomedical Computer Sciences and Mechatronics; Eduard-Wallnöfer-Zentrum 1 6060 Hall/Tyrol Austria
4. Medical University Graz; Research Unit HCI-KDD, Institute for Medical Informatics; Statistics and Documentation Austria
5. Graz University of Technology; Institute for Information Systems and Computer Media; Austria