“…Their approaches vary substantially including, for example, cognitive behavioral therapy (CBT) programs [ 11 ], rehabilitation programs [ 12 ], case management [ 13 ], or, quite frequently, complex interventions combining clinical and work-directed measures [ 14 ]. Most interventions were very elaborate and costly, however, not yielding completely convincing effects regarding RTW [ 2 ]. In addition, existing studies often systematically excluded those persons with more severe mental illnesses such as schizophrenia, bipolar disorder, borderline personality disorder, or major depression [ 2 ].…”