Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (SFB 654)
Bundesministerium für Wissenschaft und Forschung (DZD e.V.; 01GI0925)
German Federal Ministry of Education and Research (DZD e.V.; 01GI0925)
Received: 29 May 2019
Accepted: 15 November 2019
First Online: 12 December 2019
Ethics approval and consent to participate
: Ethics approval for the study was given by the Ethics committee of the Medical Faculty of the University of Tuebingen (Project number: 034/2014 BO1, Ethik Kommission, Eberhard Karls University, Gartenstraße 47, 72074 Tuebingen, Germany) and written informed parental consent was obtained.
: Not applicable.
: The authors declare that they have no competing interests.