Text and Data Mining valid from 2019-06-10
Received: 17 March 2019
Accepted: 22 May 2019
First Online: 10 June 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants performed by any of the authors. All applicable guidelines for the care and use of animals were followed by the 4th affiliated hospital of CMU (Shenyang, China).
: Informed consent was obtained from all individual participants included in the study.