9Lund T, Labriola M, Christemen KB, et al. Physical work environment risk factors for long term sickness: prospective findings among a cohort of 5357 employees in Denmark [J]. BMJ, 2006, 332 (7539): 449--452.
10Christensen KB, Lund T, Labriola M, et al. The fraction of long--term sickness absence attributable to work environmental factors: prospective results from the danish work environment cohort study[J]. Occup Environ Med, 2007, 64(7): 487--489.
