Funding for this research was provided by:
Guangxi Autonomous Region Construction Project of Clinical Research Center for Fetus Disease (AD17129016)
Text and Data Mining valid from 2019-01-14
Received: 31 May 2018
Accepted: 17 December 2018
First Online: 14 January 2019
Compliance with ethical standards
: There are no financial or other relations that could lead to a conflict of interest.