Zhao, Juanhong
Li, Haixia
Yuan, Miao
Article History
Received: 1 December 2020
Accepted: 10 February 2021
First Online: 9 March 2021
Compliance with ethical standards
:
: Author Haixia Li, author Juanhong Zhao, and author Miao Yuan declare that they have no conflicts of interest.
: All procedures performed in studies involving human participants were conducted in accordance with the ethical standards of the Women and Children’s Health Care Hospital of Linyi, Hospital of Shandong Medical College, the First Affiliated Hospital of Shandong First Medical University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.