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The authors and journal apologize for the error in the above paper which appeared in  161  (1)  131–140 . The kits for the assay of free metanephrines were supplied by both Immunodiagnostic Systems Ltd (IDS), Tyne and Wear, UK and also Biotech-IgG (UK) Ltd, Wilmslow, UK.

Evaluation of an enzyme immunoassay for plasma-free metanephrines in the diagnosis of catecholamine-secreting tumors