Received: 21 March 2019
Accepted: 20 September 2019
First Online: 27 October 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan. The need for patient consent was waived by the committee. (IRB No. 201701561B0).
: Not applicable.
: All the authors have no conflicts of interest to disclose.