“…One of the problems related to sickness certification is the difficulty in handling the dual roles of patient advocate and medical expert for other authorities like social security, where the responsibility to the patient often outweighs that of medical expert [9,8,13,4,11,14]. Physicians have reported assessments of functioning, work ability, and the need for sick leave as being problematic [6,15,4], especially when the patient describes symptoms that are difficult to diagnose and clinical findings are missing [9,5,13,16].…”