1. 3rd Department of Internal Medicine; 1st Faculty of Medicine; Charles University in Prague and General University Hospital in Prague; Prague Czech Republic
2. Department of Occupational Medicine; 1st Faculty of Medicine; Charles University in Prague and General University Hospital in Prague; Prague Czech Republic
3. J. Heyrovsky Institute of Physical Chemistry of the CAS CR, v.v.i.; Prague Czech Republic
4. Department of Ophthalmology; 1st Faculty of Medicine; Charles University in Prague and General University Hospital in Prague; Prague Czech Republic