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Petersdorf RG, Beeson PB. Fever of unknown origin: report on 100 cases. Medicine 40: 1-30, 1961."},{"key":"2","unstructured":"2. Durack DT, Street AC. Fever of unknown origin-reexamined and redefined. Curr Clin Top Infect Dis 11: 35-51, 1991."},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Alt HL, Barker MH. Fever of unknown origin. JAMA 94: 1457-1461, 1930.","DOI":"10.1001\/jama.1930.02710450001001"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. de Kleijn EM, Vandenbroucke JP, van der Meer JW. Fever of unknown origin (FUO). I A. prospective multicenter study of 167 patients with FUO, using fixed epidemiologic entry criteria. The Netherlands FUO Study Group. Medicine (Baltimore) 76: 392-400, 1997.","DOI":"10.1097\/00005792-199711000-00002"},{"key":"5","unstructured":"5. Vanderschueren S, Knockaert D, Adriaenssens T, et al. From prolonged febrile illness to fever of unknown origin: the challenge continues. 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Fever of unknown origin: analysis of 71 consecutive cases. Am J Med Sci 334: 92-96, 2007."},{"key":"11","unstructured":"11. Kucukardali Y, Oncul O, Cavuslu S, et al. The spectrum of diseases causing fever of unknown origin in Turkey: a multicenter study. Int J Infect Dis 12: 71-79, 2008."},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Cunha BA. Fever of unknown origin: focused diagnostic approach based on clinical clues from the history, physical examination, and laboratory tests. Infect Dis Clin North Am 21: 1137-1187, 2007.","DOI":"10.3109\/9781420019582"},{"key":"13","unstructured":"13. Shoji S, Imamura A, Imai Y, et al. Fever of unknown origin: a review of 80 patients from the Shin'etsu area of Japan from 1986-1992. Intern Med 33: 74-76, 1994."},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Iikuni Y, Okada J, Kondo H, Kashiwazaki S. Current fever of unknown origin 1982-1992. 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Kasai K, Mori M, Hara R, Miyamae T, Imagawa T, Yokota S. National survey of childhood febrile illness cases with fever of unknown origin in Japan. Pediatr Int 53: 421-425, 2011.","DOI":"10.1111\/j.1442-200X.2010.03296.x"},{"key":"20","doi-asserted-by":"crossref","unstructured":"20. Ohshima H, Naito T, Kukino J, et al. An analysis of the 215 patients with fever of unknown origin. Juntendo Medical Journal 51: 167-173, 2005 (in Japanese, Abstract in English).","DOI":"10.14789\/pjmj.51.167"},{"key":"21","doi-asserted-by":"crossref","unstructured":"21. Bleeker-Rovers CP, Vos FJ, Mudde AH, et al. A prospective multicenter study of the value of FDG-PET as part of a structured diagnostic protocol in patients with fever of unknown origin. Eur J Nucl Med Mol Imaging 34: 694-703, 2007.","DOI":"10.1007\/s00259-006-0295-z"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22. Horowitz HW. Fever of unknown origin or fever of too many origins? 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