Text and Data Mining valid from 2019-04-18
Received: 11 October 2018
Accepted: 31 March 2019
First Online: 18 April 2019
Ethics approval and consent to participate
: Ethical approval was received from the Ethic Committee of School of Nursing, Sun Yat-sen University and the Third Affiliated Hospital of Sun Yat-sen University. All mothers were assured that their data would be kept confidential, that their participation was voluntary and that they could withdraw from the study at any time. They were informed of the purpose and the procedure of the study and all mothers gave written consent before inclusion.
: Not applicable.
: Alex Wang is a member of the editorial board (Associate Editor) of BMC Pregnancy and Childbirth.
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