1. Global cancer statistics;Parkin;CA Cancer J Clin,1999
2. Prostate cancer epidemiology;Grönberg;Lancet,2003
3. Cancer incidence in five continents. Volume VII;IARC Sci Publ,1997
4. Patterns of cancer incidence among the population of Qatar: a worldwide comparative study;Bener;Asian Pac J Cancer Prev,2008
5. Cancer of the Prostate - SEER Stat Fact Sheets. Available at: http://seer.cancer.gov/statfacts/html/prost.html. Accessed March 22, 2015.