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Field, J., Baldwin, D., Brain, K., Devaraj, A., Eisen, T., Duffy, S. W., Hansell, D. M., Kerr, K., Page, R., Parmar, M., Weller, D., Whynes, D., & Williamson, P. (2012). authors' response. Thorax, 67(7), 650. http://access.bl.uk/ark:/81055/vdc_100135163629.0x000025