1 University of Twente, Centre for eHealth ad Wellbeing Research, Department of Psychology, Health and Technology, Enschede, The Netherlands; University of Oulu, Oulu Advanced Research on Service and Information Systems, Faculty of Information Technology and Electrical Engineering, Oulu, Finland; Abo Akademi University, Turku, Finland; University of Twente, Centre for eHealth ad Wellbeing Research, Department of Psychology, Health and Technology, Enschede, The Netherlands. Electronic address: s.m.kelders@utwente.nl.
2 University of Twente, Centre for eHealth ad Wellbeing Research, Department of Psychology, Health and Technology, Enschede, The Netherlands; University of Oulu, Oulu Advanced Research on Service and Information Systems, Faculty of Information Technology and Electrical Engineering, Oulu, Finland; Abo Akademi University, Turku, Finland; University of Twente, Centre for eHealth ad Wellbeing Research, Department of Psychology, Health and Technology, Enschede, The Netherlands.