Text and Data Mining valid from 2018-10-01
Received: 13 June 2018
Accepted: 20 September 2018
First Online: 1 October 2018
Compliance with ethical standards
: Author JTP and author RB have received financial support for education from Stryker. Authors CEHS, KRB, RTN and DM have no conflicts of interest to disclose.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (Scotland A Research Ethics Committee) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.