Received: 2 February 2021
Accepted: 11 May 2021
First Online: 31 May 2021
: This study was approved by the Ethics Committee of Beijing Anding Hospital Capital Medical University (No. 2015–126). All methods were performed in accordance with the relevant guidelines of IGH-GCP and law of China. All subjects understood the purpose and procedure of the study and provided informed written consent prior to enrollment. They were aware they could withdraw their data at any point.
: Not applicable.
: The authors declare that they have no competing interests.