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(2005) Cushing\u2019s syndrome due to ectopic corticotropin secretion: twenty years\u2019 experience at the National Institutes of Health. J Clin Endocrinol Metab 90: 4955\u20134962.","DOI":"10.1210\/jc.2004-2527"},{"key":"2","unstructured":"2 Mugharbil ZH, Tannenbaum M, Schapira H (1987) Retroperitoneal malignant fibrous histiocytoma: case report and literature review. Mt Sinai J Med 54: 158\u2013161."},{"key":"3","doi-asserted-by":"crossref","unstructured":"3 Walenkamp AM, Sonke GS, Sleijfer DT (2009) Clinical and therapeutic aspects of extrapulmonary small cell carcinoma. Cancer Treat Rev 35: 228\u2013236.","DOI":"10.1016\/j.ctrv.2008.10.007"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4 Feffer JB, Branis NM, Albu JB (2018) Dual paraneoplastic endocrine syndromes heralding onset of extrapulmonary small cell carcinoma: a case report and narrative review. 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(1984) Ectopic secretion of corticotropin-releasing factor as a cause of Cushing\u2019s syndrome. A clinical, morphologic, and biochemical study. N Engl J Med 311: 13\u201320.","DOI":"10.1056\/NEJM198407053110103"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11 Shahani S, Nudelman RJ, Nalini R, Kim HS, Samson SL (2010) Ectopic corticotropin-releasing hormone (CRH) syndrome from metastatic small cell carcinoma: a case report and review of the literature. Diagn Pathol 5: 56.","DOI":"10.1186\/1746-1596-5-56"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12 Tsuchiya K, Minami I, Tateno T, Izumiyama H, Doi M, et al. (2005) Malignant gastric carcinoid causing ectopic ACTH syndrome: discrepancy of plasma ACTH levels measured by different immunoradiometric assays. 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