Funding for this research was provided by:
Nanjing Medical Science and Technology Development Foundation (YKK13105)
Nanjing Science and Technology Development Foundation (201402049)
Text and Data Mining valid from 2018-04-11
Received: 1 September 2017
Accepted: 4 April 2018
First Online: 11 April 2018
Ethics approval and consent to participate
: All human materials were obtained in accordance with the hospital’s regulations and hence were approved by the Ethics Committee of Nanjing First Hospital. Written informed consent was waived because of the retrospective nature of the study.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.