1. Associate Practice at Königsallee/Centre for Molecular Orthopaedics; Königsallee 53-55 Düsseldorf 40212 Germany
2. Clinic for Orthopaedics and Trauma Surgery; St. Josef Hospital; Asberger Str. 4 Moers 47441 Germany
3. Institute of Experimental Psychology; Heinrich Heine-University; Universitätsstr. 1 Düsseldorf 40225 Germany