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Article History

Received: 9 January 2020

Accepted: 20 January 2020

First Online: 29 January 2020

Ethics approval and consent to participate

: Ethics approval was collected in all four countries respectively. The study was approved by: The Swedish Ethical Review Authority in Lund (Dnr 2012/73), The Regional Ethical Review Board, Medical Sciences in Stip, Macedonien (2015–225/02), University Clinical Center Tuzla; Sector for Scientific-Research and Professional Development (No; 2016/01), Clinical Hospital Center of Sestre milosrdnice Zagreb, Ethics Committee of KBSc of Sisters of Mercy, (No; 2016/06). If the children and/or the parents answered the questionnaire this was considered as a written consent to participate.

: Not applicable

: The authors declare that they have no competing interests.