Received: 2 June 2018
Accepted: 16 July 2019
First Online: 25 July 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of the China Medical University. Informed consent was obtained from each patient to use their specimens for research purposes. Written consent was provided in the ethics approval and consent form.
: Not applicable.
: The authors declare that they have no competing interests.