Participants were randomised to CAU or one of two group interventions in addition to CAU. These were: a) group cognitive behavioural based therapy (CBT) administered by psychologists once a week for 12 weeks, and b) group multimodal intervention (MMI) based on a protocol comprising a mix of existing group interventions and exercises borrowed from multiple techniques and therapeutic schools and administered by assistant nurses with brief training, including two sessions per week for 6 weeks.