Text and Data Mining valid from 2019-11-14
Received: 10 June 2019
Accepted: 18 September 2019
First Online: 14 November 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Ethical approval was granted by the Institutional Review Board of Chang Gung Memorial Hospital at Linkou, and all procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.