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Article History

Received: 20 July 2018

Accepted: 7 September 2018

First Online: 17 September 2018

Ethics approval and consent to participate

: All procedures performed in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Written informed consent was obtained from all individual participants included in the study.

: Not applicable.

: Pr Denis Agostini is a consultant for Spectrum Dynamics Ltd. There is no other potential conflict of interest relevant to his article.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.