Inclusion Criteria:  Patient in substance use treatment at a treatment centre under Akershus University Hospital or Oslo University Hospital.  Exclusion Criteria:  Staff considers the patient to be unable to give informed consent/valid responses on the questionnaire OR staff considers participation to be too stressful/burdensome to the patient. Staff are asked to take the following into consideration when making their assessment:  Acute withdrawal Acute intoxication Serious mental health concerns Serious physical health concerns