Acknowledgements
The authors have received grants from the Danish Council for Independent Research in Medical Sciences, The Arvid Nilssons Foundation, The Astrid Thaysens Foundation and the Lundbeck Foundation Center for Interventional Research in Radiation Oncology (CIRRO). The authors wish to thank Ingemar Näslund for providing the Gold AnchorTM implantation devices.
Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.