Funding for this research was provided by:
Beijing Municipal Science and Technology Commission (D171100006517003)
Received: 15 June 2020
Accepted: 17 August 2020
First Online: 24 August 2020
Ethics approval and consent to participate
: This protocol has been reviewed and approved by the Ethics Committee of Beijing Friendship Hospital, Capital Medical University; Beijing Cancer Hospital; Peking University People’s Hospital; Peking University First Hospital; Chinese PLA General Hospital; and Cancer Hospital Chinese Academy of Medical Sciences. According to the requirements of the ethics committee, the prospective study was conducted after the enrolled patients signed the informed consent. However, the requirement for informed consent was waived in the retrospective study. This clinical trial is consistent with the principles of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.