1. World Health Organization. Cancer mortality and morbidity. http://www.who.int/gho/ncd/mortality_morbidity/cancer/en/index.html. Accessed April 18, 2013.
2. National Cancer Institute. Cancer topics. http://www.cancer.gov/cancertopics. Accessed April 18, 2013.
3. National Cancer Institute. Cancer incidence rate. http://www.cancer.gov/statistics/glossary/incidence. Accessed April 18, 2013.
4. National Cancer Institute. Cancer mortality rate. http://www.cancer.gov/statistics/glossary/mortality. Accessed April 18, 2013
5. National Cancer Institute. Search for clinical trials [searched for all cancer types]. http://www.cancer.gov/clinicaltrials/search/results?protocolsearchid=6158092&vers=1. Accessed April 18, 2013.