1. Section of Bariatric and Minimally Invasive Surgery, Department of Surgery; Stanford University School of Medicine; Stanford California USA
2. Department of Computer Science; Lucerne University of Applied Sciences and Arts; Lucerne Switzerland
3. International Centre for Surgical Safety, Keenan Institute for Biomedical Science; St Michael's Hospital; Toronto Ontario Canada
4. Quality of Life Technologies Laboratory; University of Geneva, Geneva, Switzerland, and University of Copenhagen; Copenhagen Denmark
5. Department of Computer Science; University of Copenhagen; Copenhagen Denmark