Jemal, A; Bray, F; Center, MM; Ferlay, J; Ward, E; Forman, D (2011). "Global cancer statistics". CA: A Cancer Journal for Clinicians. 61 (2): 69–90. doi:10.3322/caac.20107. PMID21296855.
Jemal, A; Bray, F; Center, MM; Ferlay, J; Ward, E; Forman, D (2011). "Global cancer statistics". CA: A Cancer Journal for Clinicians. 61 (2): 69–90. doi:10.3322/caac.20107. PMID21296855.