From the Research Center of Occupational Medicine, Peking University Third Hospital, Beijing, People’s Republic of China (Y.Z., L.G., J.Z.); Department of Anesthesiology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China (Z.W., X.L.); Department of Emergency, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of China (P.J.); Department of Oncology, First Hospital of Qinhuangdao, Qinhuangdao, Hebei Province, People’s Republic of China (T.G.); and Beijing Institute of Hepatology, Beijing Youan Hospital affiliated with Capital Medical University, Beijing, People’s Republic of China (T.W.).
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Supplemental Digital Content is available for this article. Direct URL citations appear in the printed text and are available in both the HTML and PDF versions of this article. Links to the digital files are provided in the HTML text of this article on the Journal’s Web site (
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Drs. Zhang, Z. Wen, and Lv contributed equally to this work.
Drs. Zhang, Z. Wen, and Lv contributed equally to this work.
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Submitted for publication January 28, 2014. Accepted for publication July 31, 2014.
Submitted for publication January 28, 2014. Accepted for publication July 31, 2014.
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Address correspondence to Dr. Tao Wen: Beijing Institute of Hepatology, Beijing Youan Hospital affiliated with Capital Medical University, No. 8 Xitouiao, Youan Men Wai, Beijing 100069, People’s Republic of China.
wentao528@gmail.com. Information on purchasing reprints may be found at
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