1. Institute of Microbiology and Immunology, Faculty of Medicine, University of Ljubljana, Zaloška Cesta 4, SI-1000 Ljubljana, Slovenia
2. Department of Public Health, Faculty of Medicine, University of Ljubljana, Zaloška Cesta 4, SI-1000 Ljubljana, Slovenia
3. Sežana Hospital, Cankarjeva Ulica 4, SI-6210 Sežana, Slovenia
4. Karst Research Institute, Research Centre of the Slovenian Academy of Sciences and Arts, Titov Trg 2, SI-6230 Postojna, Slovenia
5. UNESCO Chair on Karst Education, University of Nova Gorica, SI-5271 Vipava, Slovenia