Cigarette smoking increases the risk of nasopharyngeal carcinoma through the elevated level of IgA antibody against Epstein‐Barr virus capsid antigen: A mediation analysis oleh Wan‐Lun Hsu, Yin‐Chu Chien, Yen‐Tsung Huang, Kelly J. Yu, Jenq‐Yuh Ko, Ching‐Yuan Lin, Yung‐An Tsou, Yi‐Shing Leu, Li‐Jen Liao, Yen‐Liang Chang, Jia‐Ying Su, Zhiwei Liu, Cheng‐Ping Wang, Shyuang‐Der Terng, Chun‐Hung Hua, Jehn‐Chuan Lee, Tsung‐Lin Yang, Chu‐Hsing Kate Hsiao, Ming‐Shiang Wu, Ming‐Hsui Tsai, Ming‐Jiung Liu, Pei‐Jen Lou, Allan Hildesheim, Chien‐Jen Chen, the GEV‐NPC Study Group