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Authors
Guan, Xu
Ma, Chen-xi
Quan, Ji-chuan
Li, Shuai
Zhao, Zhi-xun
Chen, Hai-peng
Yang, Ming
Liu, Zheng
Jiang, Zheng
Wang, Xi-shan
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Article History
Received: 19 January 2019
Accepted: 9 July 2019
First Online: 17 July 2019
Ethics approval and consent to participate
: Since the data collected form the SEER database were anonymized and de-identified prior to release, they do not require informed patient consent in our study. This study was approved by the Ethics Committee of National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College institutional review board. All methods were performed in accordance with relevant guidelines of the SEER database.
: Not applicable.
: The authors declare that they have no competing interests.
