Funding for this research was provided by:
Shanghai Science and Technology Commission Program (18411969500)
Shanghai Municipal Commission of Health and Family Planning Program (201740223)
Text and Data Mining valid from 2019-05-20
Received: 7 January 2019
Revised: 15 April 2019
Accepted: 29 April 2019
First Online: 20 May 2019
Ethics approval and consent to participate
: The present work was developed according to the principles recommended for experimentation with human beings determined by the Institutional Review Board of Tongji University, and ethics committee approval was obtained (No.2018-012). All subjects enrolled were informed about the procedures and objectives of the study and signed a consent form.
: Not applicable.
: The authors declare that they have no competing interests.
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