Department of Physical Medicine, Rehabilitation and Occupational Medicine, Medical University of Vienna, Austria. Electronic address: Katharina.Kerschan-Schindl@meduniwien.ac.at. Department of Nutrition and Dietetics, Harokopio University, Greece. Institute of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Austria. Department of Cardiovascular Surgery, Krankenhaus Nord, Austria. Department of Nursing, University of Peloponnese, Greece. Department of Laboratory Medicine, Medical University of Vienna, Austria.