1. National Cancer Institute, National Institutes of Health seer.cancer.gov/2011update.html 2014
2. Centers for Disease Control and Prevention cdc.gov/cancer/lung/statistics/index.htm 2014
3. Centers for Disease Control and Prevention cdc.gov/nchs/nhis.htm 2014
4. National Cancer Institute Surveillance, Epidemiology, and End Results Program seer.gov/statfacts/html/lungb.html 2014
5. US lung cancer trends by histologic type;Lewis;Cancer,2014