Received: 19 February 2020
Accepted: 14 May 2020
First Online: 25 May 2020
Ethics approval and consent to participate
: The Ethics Committee of the 2nd Affiliated Hospital of Guangzhou Medical University approved the study protocol. An informed written consent was taken from the patients to participate in the study.
: A written informed consent in a local language, approved by the Ethics Committee of the 2nd Affiliated Hospital of Guangzhou Medical University, was provided by Patient. The consent covered the publication of potentially identifying personal and medical information including any associated images. A copy of the consent is available for review by the Editor of this journal.
: The authors declare that they have no competing interests.