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APA Citation
Cockcroft, A., Bagnall, P., Heslop, A., Andersson, N., Heaton, R., Batstone, J., Allen, J., Spencer, P., & Guz, A. (1987). controlled trial of respiratory health worker visiting patients with chronic respiratory disability.. BMJ, 294(6566), 225–228. http://access.bl.uk/ark:/81055/vdc_100143553697.0x000008