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APA Citation
Frostad, A., Soyseth, V., Haldorsen, T., Andersen, A., & Gulsvik, A. (2006). respiratory symptoms and 30 year mortality from obstructive lung disease and pneumonia. Thorax, 61(11), 951–956. http://access.bl.uk/ark:/81055/vdc_100137793564.0x000031