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Article History

Received: 16 July 2018

Accepted: 5 November 2018

First Online: 20 November 2018

Ethics approval and consent to participate

: Not applicable. No humans or animals were used in this study, which is based completely on published material.

: Not applicable. No humans or animals were used in this study, which is based completely on published material.

: All authors have completed the ICMJE uniform disclosure form at (available on request from the corresponding author) and declare: PA reports grants from Dr. Foster Intelligence, during the conduct of the study; no financial relationships with any organisation that might have interest in the submitted work in the previous three years; no other relationships or activities that could appear to have influenced the submitted work.

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