Funding for this research was provided by:
FP7 Ideas: European Research Council (245199)
Received: 28 August 2018
Accepted: 18 July 2019
First Online: 2 August 2019
: Ethical approval was not required for this study as no human or animal participants were involved.
: Not applicable.
: No competing interests have been declared by the authors. The authors certify that they have NO affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.