Funding for this research was provided by:
Young Scientists Fund (81901856)
345 Talent Project
Received: 27 January 2020
Accepted: 10 February 2020
First Online: 15 February 2020
Compliance with ethical standards
: The Ethics Committee in Shengjing Hospital of China Medical University granted approval for this retrospective study, with a waiver of informed consent because the medical records of the subjects were de-identified to ensure patient confidentiality.
: The authors declare that they have no competing interests.