36-item Short-Form questionnaire (SF-36): This is a world-wide used instrument to evaluate quality of life. It has been used to measure quality of life in many various diseases, and norm value references are available. The instrument measures physical functioning, role functional-physical, bodily pain, general health, vitality, social functioning, role functioning-emotional, and mental health. These parameters are valuable to evaluate, to estimate the effects evoked in daily life, by a change in life style factors.