Text and Data Mining valid from 2018-12-01
Received: 5 October 2018
Accepted: 4 December 2018
First Online: 17 December 2018
: Highest academic degrees:SY, M.D.; TH (Councilor of the Japanese society of Intensive Care Medicine), M.D., Ph.D.; TO, M.D.; TN, M.D., Ph.D.; KK, M.D., Ph.D.; TT, M.D., Ph.D.; TM, M.D., Ph.D.; YK (Executive Director of the Japanese society of Intensive Care Medicine, Associate Editor of Journal of Intensive Care), M.D., Ph.D.
: Owing to the retrospective nature of the study, the IRB waived the requirement for patient consent.
: Not applicable.
: The authors declare that they have no competing interests.
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