Zhang, Zhilei
Yu, Yongbo
Zheng, Jilu
Zhang, Mingxin
Niu, Haitao
Article History
Received: 22 May 2020
Accepted: 2 March 2021
First Online: 22 March 2021
Ethics approval and consent to participate
: This study was approved by the Ethic Committee of the Affiliated Hospital of Qingdao University. Informed consent was obtained in both written and verbal format from patients or guardian for participants under 16 years old to participate, and the Ethic Committee of the Affiliated Hospital of Qingdao University approved the collection of verbal consent from participants.
: Not applicable.
: Not applicable.