Funding for this research was provided by:
Allgemeine Ortskrankenkasse (AOK) (not applicable)
Text and Data Mining valid from 2019-11-13
Received: 28 March 2019
Accepted: 31 October 2019
First Online: 13 November 2019
Ethics approval and consent to participate
: Ethical approval was obtained from the Medical Association in Bremen (HR/ RE – 522, April 28th, 2016). All study participants were informed appropriately and asked for verbal assent. Parents were fully informed about the study and gave written informed consent for their children. The study is also registered at the German Clinical Trials Register: DRKS00011065 [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.