Maintenance work on the ZORA databases is scheduled for Wednesday 22 May 2019 from 20:00-22:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Lee, C Y; Kratter, R; Duvoisin, N; Taskin, A; Schilling, J (2005). Cross-sectional view of factors associated with back pain. International Archives of Occupational and Environmental Health, 78(4):319-324.