Received: 3 February 2021
Accepted: 16 July 2021
First Online: 30 July 2021
: This study was approved by the Ethics Committee of Peking Union Medical College Hospital. Following an explanation of the purpose of the study, informed consent was obtained from those patients who met the eligibility criteria and agreed to participate. All methods were performed in accordance with the relevant guidelines and regulations (Declaration of Helsinki).
: Not applicable.
: The authors declare that they have no conflict of interests.