Received: 26 December 2018
Accepted: 23 April 2019
First Online: 6 May 2019
Ethics approval and consent to participate
: The study was carried out in accordance with the principles stated in the Declaration of Helsinki, and approved by the Ethical Committee of National Taiwan University Hospital (NTUH-IRB No. 201110043RD). The Review Board approved to waive inform consent due to the retrospective study design and the research posing no more than minimal risk.
: Not applicable.
: The authors declare that they have no competing interest.
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