Text and Data Mining valid from 2019-08-05
Received: 31 May 2019
Accepted: 30 July 2019
First Online: 5 August 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Written informed consent was obtained from the participants and in case of the minor study participant, informed consent was granted from the legally authorized representatives of the minors with the option to withdraw them from the study at any time.