Funding for this research was provided by:
Instituto de Salud Carlos III (Miguel Servet programme - CP/00041)
Robert Koch Institute (1369-341)
Fondo Europeo de Desarrollo Regional (POCTEFA 2014-2020)
Received: 4 December 2018
Accepted: 25 June 2019
First Online: 12 July 2019
Ethics approval and consent to participate
: Written informed consent was obtained from all study participants or their legal guardians. The study was conducted according to the revised Declaration of Helsinki and Good Clinical Practice guidelines and was approved by all local Ethics committees (Reference numbers 11/11/93, 5/09/08, 9/06/08, 19/11/09, Universitätsmedizin Göttingen, Germany).
: Not applicable.
: The authors declare that they have no competing interests.