Received: 9 May 2019
Accepted: 31 July 2019
First Online: 16 August 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of our institution, and formal consent is not required. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional. This study was retrospective, and its results did not influence further therapeutic decision-making.
: Written informed consent for publication were obtained from all patients.
: The authors declare that they have no competing interests.