Affiliation: | 1. Institution for Statutory Accident Insurance and Prevention in the Health and Welfare Services, Department of Occupational Health Research, Pappelallee 35-37, 22089, Hamburg, Germany 2. Hospital of Pulmonary Diseases Gro?hansdorf Hamburg, Germany 3. School of Pulbic Health, Institute of Medical Sociology, University of Düsseldorf, Germany
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