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. 2019 Jan 9;19:10. doi: 10.1186/s12872-018-0981-3

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© The Author(s). 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Flow chart of the study design and enrollment. *Comorbidities: Diabetes mellitus, hypertension, hyperlipidemia, ischemic heart disease, heart failure, cerebrovascular accident, renal failure, autoimmune disease, malignancy. *Steroid: High-dose steroid. ECMO:extra-corporeal membrane oxygenation; IVIG:intravenous immunoglobulin; IABP:intraaortic balloon pumping