Funding for this research was provided by:
Chang Gung Memorial Hospital, Linkou (CORPG3F0131-2)
Received: 5 February 2019
Accepted: 31 July 2019
First Online: 16 August 2019
Ethics approval and consent to participate
: This retrospective study was reviewed and approved by the Institution Review Board of Chang Gung Memorial Hospital, Linko. Taiwan. As this was a retrospective study, written consent to participate from the study subjects was not required.
: Not applicable.
: The authors declare that they have no competing interests.