Received: 23 January 2018
Accepted: 1 February 2019
First Online: 13 February 2019
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: This project has been approved by the Human Research Ethics Committee of The University of Newcastle, Australia (H-2017-0354). Written informed consent will be obtained from all participants.
: Not applicable.
: Darren Rivett is an honorary member of the Mulligan Concept Teachers Association. The other authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.