Received: 2 January 2019
Accepted: 29 May 2019
First Online: 3 July 2019
Ethics approval and consent to participate
: This study was conducted with approval from the Ethics Committee of the Chinese PLA General Hospital. Furthermore, this study was performed with the Investigational Review Board approval. In keeping with the requirements of a retrospective description and review, informed consent was not required.
: We have obtained consent to publish from the participants.
: The authors declare that they have no competing interests.