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APA Citation
Preller, L., Heederik, D., Boleij, J. S., Vogelzang, P. F., & Tielen, M. J. (1995). lung function and chronic respiratory symptoms of pig farmers: focus on exposure to endotoxins and ammonia and use of disinfectants.. Occupational and environmental medicine, 52(10), 654–660. http://access.bl.uk/ark:/81055/vdc_100137789187.0x000015