Funding for this research was provided by:
Text and Data Mining valid from 2019-09-09
Received: 27 June 2019
Accepted: 5 September 2019
First Online: 9 September 2019
Ethics approval and consent to participate
: Approval from medical research ethical committees (1–10–72-280-13, 2012/2051, Dnr 2014/413–31, 174/13/03/03/2014), and data protection authorities was granted according to the regulations of each participating country. Oral informed assent and written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no financial interests that may conflict with this manuscript.