Funding for this research was provided by:
Chang Gung Memorial Hospital, Linkou (CORPG3G0661, COPRG3G0671)
Received: 20 October 2018
Accepted: 30 May 2019
First Online: 6 June 2019
Ethics approval and consent to participate
: This retrospective study complied with the guidelines of the Declaration of Helsinki and was approved by the Medical Ethics Committee of Chang Gung Memorial Hospital, Linkou, Taiwan. Since this study involved retrospective review of existing data, approval from the Institutional Review Board was obtained, but without specific informed consent from patients. The Institutional Review Board of Chang Gung Memorial Hospital specifically waived the need for consent (Institutional Review Board number 201701106B0) for these studies.
: Not applicable.
: The authors declare that they have no competing interests.