Huang, Qingli
Hou, Sen
Zhu, Xiuqing
Liu, Shouzhou
Article History
Received: 9 December 2019
Accepted: 20 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of People’s Hospital of Rizhao. Signed written informed consents were obtained from the patients and/or guardians.
: Not applicable.
: The authors declare that they have no competing interests.