Received: 5 January 2022
Accepted: 19 April 2022
First Online: 14 May 2022
: The study was approved by the Institutional Review Board of the National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College. Anonymous informed consents were obtained from all respondents. All methods were carried out in accordance with relevant guidelines and regulations (Declaration of Helsinki).
: Not applicable.
: The authors declare that they have no competing interests.