Funding for this research was provided by:
Nanjing medical science and technology development foundation (YKK17172)
social development project of key research and development plan of Jiangsu province (BE2018606)
Received: 28 December 2018
Accepted: 26 August 2019
First Online: 2 September 2019
Ethics approval and consent to participate
: Ethical approval was obtained from Institutional Review Board of the Second Hospital of Nanjing for this study (2018-LS-ky017). Receiving informed consent from study participants was exempted because we used medical records reviewing without personal information. Request of original data needs permission of Department of Science and Education in the Second Hospital of Nanjing.
: The authors declare that they have no competing interests.