Received: 9 May 2019
Accepted: 1 November 2019
First Online: 12 November 2019
Ethics approval and consent to participate
: The Institutional Review Board of CMUH approved this study (105-REC3–068 & 107-REC2–016) and the need for informed consents was waived.
: Not applicable.
: The authors declare that they have no competing interests.