Text and Data Mining valid from 2019-07-17
Received: 21 March 2019
Accepted: 12 June 2019
First Online: 17 July 2019
Ethics approval and consent to participate
: We have received full consent from the participants of our study for the information they provided to appear in the manuscript in aggregate form.
: We have received full consent from the participants of our study for their images to appear in the manuscript.
: The authors declare that they have no competing interests.