Funding for this research was provided by:
Natural Science Foundation of Jiangsu Province (BK20170133)
social development project of key research and development plan of Jiangsu province (BE2018606)
Article History
Received: 24 February 2020
Accepted: 26 May 2020
First Online: 9 June 2020
Ethics approval and consent to participate
: Written consent was exempted by the institutional review boards of the Second Hospital of Nanjing, since no identifying images or other personal information were included.
: All authors have read and approved the manuscript.
: The authors declare that they have no competing interests.