1 Department of Allergology, Rheumatology and Clinical Immunology, University Children's Hospital, University Medical Center Ljubljana, Bohoričeva 20, SI-1525, Ljubljana, Slovenia. tadej.avcin@kclj.si.
2 Department of Pediatrics, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia. tadej.avcin@kclj.si.
3 IRCCS Istituto Giannina Gaslini, Genoa, Italy.
4 Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics and Maternal-Infantile Sciences, University of Genoa, Genoa, Italy.