1. Department of Biochemistry and Medical Chemistry; University of Pécs; Pécs Hungary
2. Department of Paediatrics; University of Pécs; Pécs Hungary
3. Hungarian Branch of the German Cochrane Centre; University of Pécs; Pécs Hungary
4. Department of Paediatrics; San Paolo Hospital; University of Milan; Milan Italy
5. Department of Paediatrics; Fondazione IRCCS Ca' Granda; Ospedale Maggiore Policlinico; Milan Italy