Exclusion criteria
painful disorder, active malignant disease, pain
CHRONIC HEADACHES
Regular use of injected opioid drugs.Chronic headache as the dominant painful disorder.Serious mental health problems that preclude participation in a group intervention.Previous entry or randomisation in the present trial.Participation in a clinical trial of an investigational medicinal product in the last 90 days.Pregnant at time of eligibility assessment, or actively trying to become pregnant.People receiving strong opioid for the management of pain due to active malignant disease.I-WOTCH process evaluation: aims, key components, methods, analyses and data typeWe used process evaluation theory to devise a logic model specific to this intervention and its theoretical underpinnings, informed by The Information, Motivation and Behaviour Skills Model
