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Mebazaa A, Yilmaz MB, Levy P, Ponikowski P, Peacock WF, Laribi S, et al. Recommendations on pre-hospital &amp; early hospital management of acute heart failure: A consensus paper from the Heart Failure Association of the European Society of Cardiology, the European Society of Emergency Medicine and the Society of Academic Emergency Medicine. <i>Eur J Heart Fail<\/i> 2015; 17: 544\u2013558.","DOI":"10.1002\/ejhf.289"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Cohen-Solal A, Laribi S, Ishihara S, Vergaro G, Baudet M, Logeart D, et al. Prognostic markers of acute decompensated heart failure: The emerging roles of cardiac biomarkers and prognostic scores. <i>Arch Cardiovasc Dis<\/i> 2015; 108: 64\u201374.","DOI":"10.1016\/j.acvd.2014.10.002"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Adams KF Jr, Fonarow GC, Emerman CL, LeJemtel TH, Costanzo MR, Abraham WT, et al. Characteristics and outcomes of patients hospitalized for heart failure in the United States: Rationale, design, and preliminary observations from the first 100,000 cases in the Acute Decompensated Heart Failure National Registry (ADHERE). <i>Am Heart J<\/i> 2005; 149: 209\u2013216.","DOI":"10.1016\/j.ahj.2004.08.005"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Nieminen MS, Brutsaert D, Dickstein K, Drexler H, Follath F, Harjola VP, et al. EuroHeart Failure Survey II (EHFS II): A survey on hospitalized acute heart failure patients: Description of population. <i>Eur Heart J<\/i> 2006; 27: 2725\u20132736.","DOI":"10.1093\/eurheartj\/ehl193"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Tsutsui H, Tsuchihashi-Makaya M, Kinugawa S, Goto D, Takeshita A; JCARE-CARD Investigators. Clinical characteristics and outcome of hospitalized patients with heart failure in Japan. <i>Circ J<\/i> 2006; 70: 1617\u20131623.","DOI":"10.1253\/circj.70.1617"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6. Sato N, Kajimoto K, Keida T, Mizuno M, Minami Y, Yumino D, et al. Clinical features and outcome in hospitalized heart failure in Japan (from the ATTEND Registry). <i>Circ J<\/i> 2013; 77: 944\u2013951.","DOI":"10.1253\/circj.CJ-13-0187"},{"key":"7","doi-asserted-by":"crossref","unstructured":"7. Ross JS, Normand SL, Wang Y, Ko DT, Chen J, Drye EE, et al. Hospital volume and 30-day mortality for three common medical conditions. <i>N Engl J Med<\/i> 2010; 362: 1110\u20131118.","DOI":"10.1056\/NEJMsa0907130"},{"key":"8","doi-asserted-by":"crossref","unstructured":"8. Yasuda S, Nakao K, Nishimura K, Miyamoto Y, Sumita Y, Shishido T, et al. The current status of cardiovascular medicine in Japan: Analysis of a large number of health records from a nationwide claim-based database, JROAD-DPC. <i>Circ J<\/i> 2016; 80: 2327\u20132335.","DOI":"10.1253\/circj.CJ-16-0196"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Knafl GJ, Grey M. Factor analysis model evaluation through likelihood cross-validation. <i>Stat Methods Med Res<\/i> 2007; 16: 77\u2013102.","DOI":"10.1177\/0962280206070649"},{"key":"10","unstructured":"10. Norm OR, Hatcher L. A step-by-step approach to using SAS\u00ae for factor analysis and structural equation modeling, 2nd edn. SAS Institute Inc., Cary, NC, 2013."},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Tziakas DN, Chalikias GK, Kaski JC, Kekes A, Hatzinikolaou EI, Stakos DA, et al. Inflammatory and anti-inflammatory variable clusters and risk prediction in acute coronary syndrome patients: A factor analysis approach. <i>Atherosclerosis<\/i> 2007; 193: 196\u2013203.","DOI":"10.1016\/j.atherosclerosis.2006.06.016"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Manhenke C, Orn S, von Haehling S, Wollert KC, Ueland T, Aukrust P, et al. Clustering of 37 circulating biomarkers by exploratory factor analysis in patients following complicated acute myocardial infarction. <i>Int J Cardiol<\/i> 2013; 166: 729\u2013735.","DOI":"10.1016\/j.ijcard.2011.11.089"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Egnot NS, Barinas-Mitchell E, Criqui MH, Allison MA, Ix JH, Jenny NS, et al. 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Hamaguchi S, Yokoshiki H, Kinugawa S, Tsuchihashi-Makaya M, Yokota T, Takeshita A, et al. Effects of atrial fibrillation on long-term outcomes in patients hospitalized for heart failure in Japan: A report from the Japanese Cardiac Registry of Heart Failure in Cardiology (JCARE-CARD). <i>Circ J<\/i> 2009; 73: 2084\u20132090.","DOI":"10.1253\/circj.CJ-09-0316"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22. Mamas MA, Caldwell JC, Chacko S, Garratt CJ, Fath-Ordoubadi F, Neyses L. A meta-analysis of the prognostic significance of atrial fibrillation in chronic heart failure. <i>Eur J Heart Fail<\/i> 2009; 11: 676\u2013683.","DOI":"10.1093\/eurjhf\/hfp085"},{"key":"23","doi-asserted-by":"crossref","unstructured":"23. Mountantonakis SE, Grau-Sepulveda MV, Bhatt DL, Hernandez AF, Peterson ED, Fonarow GC. 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Cleland JG, Daubert J, Erdmann E, Freemantle N, Gras D, Kappenberger L, et al. The effect of cardiac resynchronization on morbidity and mortality in heart failure. <i>N Engl J Med<\/i> 2005; 352: 1539\u20131549.","DOI":"10.1056\/NEJMoa050496"},{"key":"27","doi-asserted-by":"crossref","unstructured":"27. Bunch TJ, May HT, Bair TL, Jacobs V, Crandall BG, Cutler M, et al. Five-year outcomes of catheter ablation in patients with atrial fibrillation and left ventricular systolic dysfunction. <i>J Cardiovasc Electrophysiol<\/i> 2015; 26: 363\u2013370.","DOI":"10.1111\/jce.12602"},{"key":"28","doi-asserted-by":"crossref","unstructured":"28. Marrouche NF, Brachmann J, Andresen D, Siebels J, Boersma L, Jordaens L, et al. Catheter ablation for atrial fibrillation with heart failure. <i>N Engl J Med<\/i> 2018; 378: 417\u2013427.","DOI":"10.1056\/NEJMoa1707855"},{"key":"29","doi-asserted-by":"crossref","unstructured":"29. Piepoli MF, Davos C, Francis DP, Coats AJ; ExTraMATCH Collaborative. Exercise training meta-analysis of trials in patients with chronic heart failure (ExTraMATCH). <i>BMJ<\/i> 2004; 328: 189.","DOI":"10.1136\/bmj.37938.645220.EE"},{"key":"30","doi-asserted-by":"crossref","unstructured":"30. Keteyian SJ, Leifer ES, Houston-Miller N, Kraus WE, Brawner CA, O\u2019Connor CM, et al. Relation between volume of exercise and clinical outcomes in patients with heart failure. <i>J Am Coll Cardiol<\/i> 2012; 60: 1899\u20131905.","DOI":"10.1016\/j.jacc.2012.08.958"},{"key":"31","doi-asserted-by":"crossref","unstructured":"31. Gielen S, Adams V, M\u00f6bius-Winkler S, Linke A, Erbs S, Yu J, et al. Anti-inflammatory effects of exercise training in the skeletal muscle of patients with chronic heart failure. <i>J Am Coll Cardiol<\/i> 2003; 42: 861\u2013868.","DOI":"10.1016\/S0735-1097(03)00848-9"},{"key":"32","doi-asserted-by":"crossref","unstructured":"32. Schweickert WD, Pohlman MC, Pohlman AS, Nigos C, Pawlik AJ, Esbrook CL, et al. 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