Received: 1 March 2019
Accepted: 22 October 2019
First Online: 10 January 2020
Ethics approval and consent to participate
: The study has gained ethical approval at both central and local levels. Central ethical approval has been confirmed from Ethikkommission der Medizinischen Universität Graz no. 30-385ex17/18 and we will not begin recruiting at other centres in the trial until local ethical approval has been obtained. The application for ethics approval has been sent to the local ethics committee; ethics approval has been received on 5 October 2018. Any patient included in this study has to sign an informed consent. The informed consent form is available from the corresponding author on request.
: All authors give consent for publication. All authors read and approved the final manuscript.
: The authors declare that they have no competing interests.