Received: 28 February 2020
Accepted: 6 October 2020
First Online: 12 October 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The present study was approved by the Medical Ethics Committee of Nanfang Hospital and The First Affiliated Hospital of Shantou University Medical College. Written informed consent was obtained from all participants included in the study.
: Not Applicable.
: The authors declare that they have no competing interests.