Received: 21 February 2019
Accepted: 23 August 2019
First Online: 30 August 2019
Ethics approval and consent to participate
: The waiver approval for the medical charts review was approved by the Institutional Review Boards of China Medical University Hospital (No. CMUH103-REC1–078), because this retrospective study represented no more than minimal risk to subjects, and did not adversely affect their rights and welfare.
: Not Applicable.
: The authors declare that they do not have any competing interests.