Grgič-Vitek M, Frelih T, Ucakar V, Fafangel M, Jordan Markocic O, Prosenc K, Kraigher A
Communicable Diseases Centre, National Institute of Public Health (NIJZ), Ljubljana, Slovenia.
Euro Surveill. 2015 Jan 22;20(3):21012. doi: 10.2807/1560-7917.es2015.20.3.21012.