Funding for this research was provided by:
Federal Ministry of Education and Research of Germany (01PL12011A, 01PL17011A)
Received: 10 February 2019
Accepted: 17 January 2020
First Online: 4 February 2020
Ethics approval and consent to participate
: This research was performed in accordance with the Declaration of Helsinki. The study does not involve any human subjects, including research on identifiable human material and data. The study was approved by the deans of studies of all participating medical faculties. The ethics committee of the Medical Faculty of Tuebingen University confirmed that no formal ethics approval was required for this study (Project-No: 622/2018BO2).
: Consent for publication is not applicable for this study. The usage of data was approved in all participating medical faculties by the deans’ office and/or local authorized persons.
: The authors declare that they have no competing interests.