Funding for this research was provided by:
Science and Technology Planning Project of Guangdong Province (2017ZC0378, 2014A020212237)
Guangzhou Municipal Science and Technology Innovation Council (201904010458 and 201510010290)
Key Project of Guangdong Provincial Administration of Traditional Chinese Medicine (20184005)
Text and Data Mining valid from 2020-02-27
Received: 17 June 2019
Accepted: 14 February 2020
First Online: 27 February 2020
Ethics approval and consent to participate
: The study was approved by Institutional ethical committee of Guangdong Maternal and Child Health Hospital. The study was conducted in accordance with the Good Clinical Practice guidelines and Declaration of Helsinki. All the study participants provided written informed consent at enrolment.
: Not applicable.
: The author(s) declare that they have no competing interests.