children's periodicals comparative research 1 Exclude matching results deti predškolského veku 1 Exclude matching results deti školského veku 1 Exclude matching results komparatívny výskum 1 Exclude matching results preschool children 1 Exclude matching results research projects 1 Exclude matching results school children 1 Exclude matching results výskumné projekty 1 Exclude matching results časopisy pre deti 1 Exclude matching results