Funding
This work was supported by grants from the National Science
Council, Taiwan (grant nos. NSC 93-2314-B-182-068
and NSC 97-2621-M-182-001) and Chang Gung Medical
Foundation (grant no. CMRPD190521).
Conflict of interest
No conflict of interest has been declared by the authors.
Author contributions
All authors meet at least one of the following criteria (recommended
by the ICMJE: http://www.icmje.org/ethical_
1author.html) and have agreed on the final version:
● substantial contributions to conception and design,
acquisition of data, or analysis and interpretation of
data;
● drafting the article or revising it critically for important
intellectual content.