1. Praxis für Psychotherapie; Kleine Ulrichstraße 36; 06108; Halle/Saale; Germany
2. Center for Medical Statistics; Informatics and Intelligent Systems; Medical University of Vienna; Allgemeines Krankenhaus; Spitalgasse 23; 1090; Vienna; Austria
3. Department of Special Anaesthesia and Pain Therapy; Medical University of Vienna; Allgemeines Krankenhaus; Währinger Gürtel 18-20; 1090; Vienna; Austria