1. Department of Health Science and Technology, Aalborg University, Aalborg Denmark.
2. Center for Information Technology Research in the Interest of Society, University of California, Berkeley, Berkeley, California.
3. Health, Aarhus University, Aarhus, Denmark.
4. School of Public Health, University of California, Berkeley, Berkeley, California.
5. Department of Health and Nursing Science, University of Agder, Agder, Norway.
6. Department of Computer Science, University of Tromsø, Tromsø, Norway.