1. Third Department of Medicine (E.P., J.J., Z.L., Z.T., J.B.), 128 08 Prague, Czech Republic
2. Department of Management (O.P.), Faculty of Business Administration, University of Economics Prague, 130 67 Prague, Czech Republic
3. Institute of Clinical Biochemistry and Laboratory Diagnostics (D.S.), General University Hospital and First Faculty of Medicine, Charles University in Prague, 128 08 Prague, Czech Republic