[1] Comenius Univ, Dept Environm Ecol & Landscape Management, Fac Nat Sci, Ilkovicova 6, Bratislava 84215, Slovakia
[2] Univ Chem & Technol Prague, Dept Phys & Measurements, Tech 5, Prague 16628, Czech Republic
[3] Charles Univ Prague, Inst Microbiol & Immunol, Fac Med 1, Studnickova 7, Prague 12800, Czech Republic
[4] Gen Univ Hosp Prague, Studnickova 7, Prague 12800, Czech Republic
[5] Univ South Bohemia, Fac Educ, Dept Phys, Jeronymova 10, Ceske Budejovice 37115, Czech Republic