Funding for this research was provided by:
FP7 Health (281532)
Text and Data Mining valid from 2019-11-21
Received: 27 December 2018
Accepted: 23 September 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: No ethical approval was needed for this review of existing publications.
: Not applicable.
: The authors declare that they have no competing interests.