Funding for this research was provided by:
Centers for Disease Control, Taiwan (MOHW105-CDC-C-114-000103)
Text and Data Mining valid from 2018-10-23
Received: 29 May 2018
Accepted: 16 October 2018
First Online: 23 October 2018
Ethics approval and consent to participate
: The Institutional Review Board of the National Taiwan University Hospital approved the study (NTUH REC: 201205025RIC). Due to the retrospective design, inform consent was deemed unnecessary.
: Not applicable. The manuscript does not contain personal details.
: The authors declare that they have no competing interests.
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