Received: 2 April 2020
Accepted: 2 July 2020
First Online: 4 July 2020
Ethics approval and consent to participate
: The study protocol was developed in compliance with the Declaration of Helsinki, and the study was approved by the Ethics Committee of Beijing Anzhen Hospital, Capital Medical University. Before the beginning of the study, we obtained written informed consent from each patient.
: Not applicable.
: The authors declare that they have no competing interests.