Funding for this research was provided by:
Chang Gung Memorial Hospital, Linkou
Received: 12 October 2018
Accepted: 14 May 2019
First Online: 29 May 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: 201800785B0).
: Not applicable. This article contains no individual data of patients.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.