Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST 104-2325-B-110-002)
Kaohsiung Veterans General Hospital, Taiwan (VGHKS 106-112)
Kaohsiung Armed Forces General Hospital, Taiwan (103-6)
Received: 12 September 2018
Accepted: 1 October 2019
First Online: 11 November 2019
Ethics approval and consent to participate
: The Institutional Review Board (IRB) at Chi Mei Medical Center approved this study (IRB09703–001). The IRB waived the need for written informed consent from the participants because this was a retrospective review study. No ethics approval is required for these purchased cell lines (SCC4 and SAS) from the bioresource centers.
: Not applicable.
: All the authors declare that they have no conflicts of interest.