1. Department of Surgery, Manchester University NHS Foundation Trust, Oxford Rd., Manchester M13 9WL, UK
2. Department of Medicine, University of California, 550 16 Street, San Francisco, CA 94158, USA
3. Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, VA 24061, USA
4. Institute for Critical Technology and Applied Sciences, Virginia Tech, Blacksburg, VA 24061, USA
5. Department of Surgery, San Martino Hospital, 32100 Belluno, Italy
6. Department of Clinical Oncology and Palliative Care, Zealand University Hospital, 4000 Roskilde, Denmark
7. Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, 1165 Copenhagen, Denmark