Funding for this research was provided by:
Pudong New Area Science and Technology Development (PKJ 2016-Y07)
the Key research program of Shanghai Pudong New Area Health and Family Planning Commission (PWZzk2017-28)
Article History
Received: 26 March 2019
Accepted: 2 July 2019
First Online: 16 July 2019
Compliance with ethical standards
: This study was approved by the Pudong New Area People’s Hospital ethics committee. Study subjects were informed, agreed, and signed a written consent document.
: The authors declare that they have no conflict of interest.