1 Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden.
2 Department of Rehabilitation Sciences; University Psychiatric Centre - KU Leuven, KU Leuven - University of Leuven, Leuven, Belgium.
3 Department of Physiotherapy, South London and Maudsley NHS Foundation Trust; Department of Health Service and Population Research, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.