The intervention
stress-related disorders
The design of the intervention was based on the Person-Environment-Occupation model (PEO) that originates from occupational therapy, where occupational performance depends on the interaction between the person (P), the environment (E) and the occupation (O) [The intervention comprised a) a one-day training where all participant GPs and RCs were invited, b) a standardized procedure for GPs and RCs to follow after training and c) the opportunity for GPs to seek clinical advice from specialist physicians in the research group (see Fig. 
The training day was intended to increase the knowledge of both GPs and RCs about stress-related disorders and RTW. The lectures and workshops were conducted by experienced physicians, a psychologist and an occupational therapist who were also researchers at the Institute of Stress Medicine (ISM) or at the University of Gothenburg. The participants learned more about stress-related symptoms with a focus on long-term stress and ED and the most common stressors associated with ED. Another topic covered was the working conditions, psychosocial work environment, and factors that facilitate or hinder return to work. The lectures also covered work ability, based on the PEO model, as well as how to evaluate a patient's work ability. Additionally, information about the social insurance system and regulations surrounding sick leave was provided. They were also informed why the employer should be involved at an early stage of the rehabilitation process and how the employer would be involved. A total of 76 GPs and 13 RCs underwent the one-day training; the number of participating GPs per centre varied from 2 to 13, however, all GPs working at the intervention PHCCs could contribute by referring patients for inclusion in the study. The standardised procedure (Part B in Fig. 