Text and Data Mining valid from 2019-06-07
Received: 17 November 2018
Accepted: 20 May 2019
First Online: 7 June 2019
Ethics approval and consent to participate
: Ethic Approval was obtained from the institutional ethical review boards of Beijing Tongren Hospital, Capital Medical University, Beijing, China. Written informed consents were obtained from the patients for participation.
: The authors declare that they have no competing interests.