Funding for this research was provided by:
Kaohsiung Chang Gung Memorial Hospital (CMRPG8C1091 and CMRPG8D0483)
Received: 20 November 2019
Accepted: 23 February 2020
First Online: 10 March 2020
Ethics approval and consent to participate
: This research was approved by the Institutional Review Board of Chang Gung Memorial Hospital (IRB102-0771A3). Each participant submitted a signed written informed consent, while the researchers emphasized whether to take part in this research or not would never affect his or her legal status and that all personal information provided would be kept strictly confidential.
: Not applicable.
: The authors declare that they have no competing interests.