1Dept. of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå, Sweden
2Dept. of Forest Biomaterials & Technology, Swedish University of Agricultural, Sciences, Umeå, Sweden
3Dept. of Psychology, Umeå University, Umeå, Sweden
4Dept. of Radiation Sciences, Biomedical Engineering, Umeå University, Umeå, Sweden