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(2014) Pathological grading for predicting metastasis in phaeochromocytoma and paraganglioma. Endocr Relat Cancer 21: 405\u2013414.","DOI":"10.1530\/ERC-13-0494"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2 Tuchman M, Morris CL, Ramnaraine ML, Bowers LD, Krivit W (1985) Value of random urinary homovanillic acid and vanillylmandelic acid levels in the diagnosis and management of patients with neuroblastoma: comparison with 24-hour urine collections. Pediatrics 75: 324\u2013328.","DOI":"10.1542\/peds.75.2.324"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3 Gregianin LJ, McGill AC, Pinheiro CM, Brunetto AL (1997) Vanilmandelic acid and homovanillic acid levels in patients with neural crest tumor: 24-hour urine collection <i>versus<\/i> random sample. Pediatr Hematol Oncol 14: 259\u2013265.","DOI":"10.3109\/08880019709009495"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4 Cangemi G, Barco S, Reggiardo G, Viscardi E, Di Cataldo A, et al. 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