Funding for this research was provided by:
Beijing Hope Run Special Fund of Cancer Foundation of China (LC2017A19)
Received: 30 September 2021
Accepted: 17 December 2021
First Online: 28 December 2021
: The ethics committee of the National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College approved this study (NCC 2017-YZ-026, 17 October 2017). The study was conformed to the ethical standards of the World Medical Association Declaration of Helsinki and all methods were carried out in accordance with relevant guidelines and regulations. Prior written informed consent was obtained from all study participants.
: Not applicable.
: The authors declare that they have no competing interests.