Assignment to treatment groups: Most of studies with more than one intervention group (30 studies) were rand- omized, controlled trials. In 4 studies, although there was a comparison group, patients were not randomized into treat- ment groups (Andres et al. 2000; 2003, Shelley et al. 2001, Wykes et al. 1999). In the remaining four studies, there was no comparison or control group.Measurement methods: In the majority of studies, in the evaluation of symptoms prior to and after treatment, both self-report and clinician measurements were employed. However, in 12 studies, measurements were based solely of the clinician’s report without any self-report measurements from the patients (for example Bechdolf et al. 2004, Combs et al. 2007). In addition, in 25 of 42 studies, in the pre-test, post-test and/or follow-up evaluations, the clinicians were in- dependent from the investigators (for example, Eckman et al. 1992, Kemp et al. 1996).