Funding for this research was provided by:
Chang Gung Memorial Hospital, Linkou (CORPG3G0971, CORPG3G1001)
Text and Data Mining valid from 2019-03-20
Received: 15 September 2018
Accepted: 12 March 2019
First Online: 20 March 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board, Chang Gung Memorial Hospital, Taiwan [The ethical approval reference number: 201700107B0].
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.