Funding for this research was provided by:
Chi Mei Medical Center (CMNCKU10203)
Received: 30 October 2018
Accepted: 9 May 2019
First Online: 16 May 2019
Ethics approval and consent to participate
: The current study received approval through an exemption from full review granted by the Institutional Review Board of the Chi-Mei Medical Center (Application number: 10701-E02).
: 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.