Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST–106–2113–M–039–006)
China Medical University Hospital (CMU106–S–17)
Article History
Received: 23 January 2019
Accepted: 12 May 2019
First Online: 25 May 2019
Compliance with ethical standards
: The author(s) declare that they have no competing interests.