Received: 11 October 2018
Accepted: 22 August 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: This study was reviewed and approved by the institutional review board of Tianjin Second People’s Hospital. This study was registered under the following project identifiers, IDs: UMIN000025378. It was conducted in accordance with the Declaration of Helsinki. Additionally, all participants who agreed to participate were only enrolled after giving written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.