Received: 18 August 2017
Accepted: 7 February 2018
First Online: 15 February 2018
Ethics approval and consent to participate
: Ethical approval was granted by the Heriot-Watt University, School of Life Sciences, Ethics Committee. All participants provided written consent for the study, were made aware that data is anonymised, securely stored, will be analysed for publication, participation is voluntary and they are free to leave the study at any time.
: Not applicable.
: The authors declare that they have no competing interests.
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