Received: 21 February 2020
Accepted: 24 August 2020
First Online: 9 September 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Sun Yat-sen University Cancer Center, the First Affiliated Hospital of Sun Yat-Sen University, Guangdong General Hospital, Nanfang Hospital of Southern Medical University and Sun Yat-sen Memorial Hospital of Sun Yat-sen University, and written informed consent was obtained from all patients prior to surgery. All procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and<i>/</i>or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Not applicable.
: The authors declare that they have no competing interests.