... drafting of < /b> the < /b> manuscript and supervision. ØE wasinvolved in conception and design, interpretation of < /b> data,drafting of < /b> the < /b> manuscript and supervision. BL wasinvolved in analysis and interpretation ... contributionsAMB was involved in conception and design, acquisition,analysis and interpretation of < /b> data and drafting of < /b> the< /b> manuscript. EH was involved in design, interpretation of< /b> data, drafting ... Rehabilitation, and the < /b> Nor-wegian Institute of < /b> Public Health. The < /b> authors thank professor Olaf G. Aasland, the < /b> Research Institute, The < /b> Norwegian Medical Association, for providing data from the < /b> Norwegian...