SLOVENIA
UL University of Ljubljana

Medical Faculty,
Institute of Microbiology and Immunology,
Laboratory for Electron Microscopy,
Zaloska 4,
1105 Ljubljana,
Slovenia 

Mateja Poljsak-Prijatelj
Janet Zimsek Mijovski
Darja Barlic-Maganja

INZ-RS Institute of Public Health

Institute of Public Health of the Republic of Slovenia,
Trubarjeva 2,
1000 Ljubljana,
Slovenia 

Ada Hocevar Grom