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   Michelle C. Turner et al, 2007, American Journal of Respiratory and Critical Care Medicine CrossRef
2. Lung Cancer and Indoor Pollution from Heating and Cooking with Solid Fuels
   Jolanta Lissowska et al, 2005, American Journal of Epidemiology CrossRef
3. Lung Cancer in Never Smokers: A Review
   Janakiraman Subramanian et al, 2007, Journal of Clinical Oncology CrossRef