Received: 8 January 2020
Accepted: 3 April 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the General Medical Council Westfalen-Lippe and the Medical Faculty of the Westphalian University of Münster (“Ethik Kommission der Ärztekammer Westfalen-Lippe und der medizinischen Fakultät der Westfälischen Wilhelms-Universität”, code No. 2013–603-f-S). Written informed consent was obtained from the parents of the children to participate in the study.
: No identifiable patient figures were used, therefore written informed consent was not necessary.
: All authors declare that they have no competing interests.