Received: 19 October 2019
Accepted: 1 June 2020
First Online: 15 June 2020
Ethics approval and consent to participate
: The study protocol was approved by the ethics review board of Jilin-Japan Union Hosipital of Jilin University. We have obtained written informed consent from all study participants. All of the procedures were performed in accordance with the Declaration of Helsinki and relevant policies in China.
: Not applicable.
: The authors declare that they have no competing interests.