Funding for this research was provided by:
Ministerial and Provincial Joint Construction Major Projects of Zhejiang province (WKJ-ZJ-1907)
Key Research and Development Program of Zhejiang Province (2019C03015)
Article History
Received: 20 April 2020
Accepted: 17 August 2020
First Online: 9 September 2020
Compliance with Ethical Standards
: Ethics approval was granted by the Ethics Committee of Women’s Hospital School of Medicine Zhejiang University (reference number 20130039) on June 2013 and all participants signed a written informed consent prior to inclusion.
: The authors declare that they have no conflicts of interest.