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CorrespondenceHoward Mason, David Chettle, Sylvia Chalkley, T. A. Smith, N. Bennett, M. T. Bithell, Anne Linehan, Mark J. Nieuwenhuijsen, Dick Heederik, Gert Doekes, Katherine M. Venables, Anthony J. Newman Taylor, Sheila Andren and Rualri Brugha · Occupational and Environmental Medicine · 1999