BRAY F , FERLAY J , SOERJOMATARAM I , et al . Global cancer statistics 2018: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries [J]. CA:Cancer J Clin , 2018 , 68 ( 6 ): 394 - 424 .
CHEN W , ZHENG R , BAADE PD , et al . Cancer statistics in China, 2015 [J]. CA:Cancer J Clin , 2016 , 66 ( 2 ) : 115 - 132 .