Funding for this research was provided by:
Tri-Service General Hospital (TSGH-C107-004)
Article History
First Online: 10 December 2019
Compliance with Ethical Standards
: All authors declare no conflict of interest to disclosure. Patient consent was not required for accessing the register data because the data were analyzed anonymously. However, ethical approval was still required because of the Taiwanese law. This study was exempted from ethical approval by the institutional review board of Taipei Tzu Chi Hospital (Taipei, Taiwan; approval no., 06-X23–089).