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Article History

Received: 28 January 2021

Accepted: 22 June 2021

First Online: 30 June 2021

Declarations

:

: This study was approved by the Ethics Committee of the Gansu Provincial Maternal and Child Health Care Hospital (No. 4 of hospital ethics review, 2016). Written informed consent was obtained from all of the adult participants and written informed consent of patients younger than 18 years old was obtained from their parents. The patient’s next to kin also have given their consent to publish for this study. Written consent to publish this information was also obtained from the patient’s next to kin.

: Written consent was obtained from all the participants and for younger that 18 years obtained form their parents. The patient’s next to kin also have given their consent to publish for this study. Written consent to publish this information was also obtained from the patient’s next to kin. The proof of consent to publish from the participant's next to kin can be requested at any time.

: The authors declare no competing interests.