Funding for this research was provided by:
Shandong Medical Technology Development Project (No.2017WS091)
Received: 9 February 2020
Accepted: 8 July 2020
First Online: 14 July 2020
Ethics approval and consent to participate
: This is a retrospective study. During treatment, alternative approaches were fully explained to adult patients or parents and legal guardians, and written informed consent for all procedures were obtained, both before data collection and before and during follow-ups. The study was approved by the Medical Ethics Committee of Provincial Hospital affiliated to Shandong First Medical University for the protection of human subjects. The committee’s reference number is 2018–056. All procedures adhered to the tenets of the Declaration of Helsinki.
: Not applicable.
: There are no competing interests to declare in relation to this work.