You seem to be attempting to access an item that has been removed from the repository.
The item you are trying to access was a duplicate of:
Christenhusz, L.C.A. and Jongh, F. de and Valk, Paul van der and Pieterse, M.E. and Seydel, E.R. (2005) Are deceiving smokers revealed by use of CO monitors as a validation tool? European Respiratory Journal, 26 (Suppl.). 56s. ISSN 0903-1936