Funding for this research was provided by:
Landesoffensive zur Entwicklung wissenschaftlich - ökonomischer Exzellenz (LOEWE), LOEWE-Zentrum für Translationale Medizin und Pharmakologie (n/a)
European Union Seventh Framework Programme (602919)
Received: 15 January 2018
Accepted: 6 April 2018
First Online: 20 April 2018
Ethics approval and consent to participate
: The study followed the Declaration of Helsinki and was approved by the Ethics Committee of the Medical Faculty of the Goethe – University Frankfurt am Main, Germany (reference number 197/13).
: Informed written consent into study participation and publication of the results in an anonymized form was obtained from all subjects.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.