Received: 17 October 2019
Accepted: 20 March 2020
First Online: 30 March 2020
Ethics approval and consent to participate
: The human materials were obtained with informed consent, and the study was approved by the China Medical University Ethics Committee. All patients signed an informed consent to participate in the study. The study on human specimens was approved by the China Medical University Ethics Committee Ethics Committee. Informed, written consent was obtained from all participants in the study.
: Not applicable.
: The authors declare that they have no competing interests.