[Methodological fundamentals for the development of the guideline].

The guideline was developed by 10 scientific societies and 2 patient self-help organizations and coordinated by the German Association of Pain Therapy (DIVS). The guideline was approved by the Association of the Scientific Medical Societies in Germany AWMF (AWMF number 041/004), april 17, 2008. No direct or indirect financial support by pharmaceutical companies was involved and there were no potential conflicts of interest for any of the 58 participants of the guideline group. The results of a systematic search of the literature (Cochrane Library [1993-12/2006], Medline [1980-12/2006], PsychInfo [1966-12/2006] and Scopus [1980-12/2006]) were analyzed by 8 working groups. A balanced composition of the working groups as to sex, level of medical care and position in medical or scientific hierarchy of their members was realized. Levels of evidence were assigned according to the classification system of the Oxford Centre for Evidence-Based Medicine. Grading of the strengths of recommendations was done according to the German program for disease management guidelines. Standardized, formal procedures to reach a consensus on recommendations were used. The guideline was reviewed by the board of directors of the societies engaged in the development of the guideline. The guideline will be published in complete and short scientific versions, clinical practice and patient versions.