Department of Medical Informatics, Marchioninistr. 15, D-81377 Munich, Germany. dug@ibe.med.uni-muenchen.de|Department of Medical Informatics, Marchioninistr. 15, D-81377 Munich, Germany. dug@ibe.med.uni-muenchen.de|Department of Medical Informatics, Marchioninistr. 15, D-81377 Munich, Germany. dug@ibe.med.uni-muenchen.de|Department of Medical Informatics, Marchioninistr. 15, D-81377 Munich, Germany. dug@ibe.med.uni-muenchen.de