1. Institute of Clinical Chemistry and Laboratory Medicine, General Hospital Steyr, Steyr, Austria
2. Department of Gastroenterology, General Hospital Steyr, Steyr, Austria
3. Clinical Institute of Medical and Laboratory Diagnostics, Medical University of Graz, Graz, Austria
4. Department of Psychiatry and Psychotherapeutic Medicine, Medical University of Graz, Graz, Austria
5. Practice for General Internal Medicine, Bruck an der Mur, Austria
6. Medical University of Graz, Graz, Austria