Received: 5 November 2018
Accepted: 4 June 2019
First Online: 28 June 2019
Ethics approval and consent to participate
: This study involving human participants was approved by the ethics committee of Shanxi Dayi Hospital (SDH-A-2017-035, Date: 2017.1.16; Shanxi, China). All the tissue samples were collected with written informed consent in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.