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Footnotes
CJ, CB, SF and JT have contributed equally.
Contributors The study was designed by JT. Data were obtained by CB, CJ, WV, MT, PM, JG, JL, MP, JC, AK, CPS SF and JT. The report was written by CB, CJ, AK, SF and JT. All authors approved the final version.
Funding This study was supported by grants from the Deutsche Forschungsgemeinschaft (SFB TRR57 to P18), the H. J. & W. Hector Stiftung, Ernst-Bertha-Grimmke-Stiftung (6/15) and European Union's Horizon 2020 research and innovation programme (No 668031).
Competing interests None declared.
Ethics approval Ethics committee of the University of Bonn (Nr. 121/14); ethics committee of the university of Antwerp (15/13/135); ethics committee of the university Odense (51872).
Provenance and peer review Not commissioned; internally peer reviewed.