Text and Data Mining valid from 2018-04-10
Received: 23 January 2018
Accepted: 27 March 2018
First Online: 10 April 2018
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Medical Board of Saxony-Anhalt (43/15) in Halle, Germany. Written consent was obtained from all parents and children prior to the exercise.
: Not applicable, there are no person’s data in any form.
: The authors declare that they have no competing interests.
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