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Gulsvik, A., P. Bakke, S. Humerfelt, E. Omenaas, T. Tosteson, S T. Weiss, ja F E. Speizer. Single Breath Transfer Factor for Carbon Monoxide in an Asymptomatic Population of Never Smokers. 1992.

Gulsvik, A., et al. Single Breath Transfer Factor for Carbon Monoxide in an Asymptomatic Population of Never Smokers. 1992.