1. Department of General Psychiatry I, State Hospital Graz II, Graz, Austria;
2. Department of Medical Psychology and Psychotherapy, Medical University of Graz, Graz, Austria;
3. Department of Internal Medicine, Hospital of the Brothers of St. John of God, Graz, Austria;
4. Institute of Medical Informatics, Statistics and Documentation, Medical University of Graz, Graz, Austria;
5. Institute of Laboratory Diagnostics, Hospital of the Brothers of St. John of God, Graz, Austria;
6. Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria