Received: 6 April 2018
Accepted: 29 May 2019
First Online: 7 June 2019
Ethics approval and consent to participate
: The current study was reviewed and approved by the institution review board (IRB) of the Kaohsiung Chang Gung Memorial Hospital (103-6335C). All participants provided written consent to participate in this study.
: Not applicable.
: The authors declare that they have no competing interests.