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International Journal of Analytical Chemistry
Volume 2010, Article ID 234808, 7 pages
http://dx.doi.org/10.1155/2010/234808
Research Article

Agreement of Immunoassay and Tandem Mass Spectrometry in the Analysis of Cortisol and Free T4: Interpretation and Implications for Clinicians

1Departments of Neurology; Biostatistics, Bioinformatics & Biomathematics and Psychiatry, Georgetown University Medical Center, Washington, DC 20007, USA
2Division of Endocrinology, Georgetown University Medical Center, Washington, DC 20007, USA
3Bioanalytic Core Laboratory, General Clinical Research Center, and Departments of Pharmacology and Medicine, Georgetown University Medical Center, Washington, DC 20007, USA

Received 3 December 2009; Accepted 29 April 2010

Academic Editor: Steen Honoré Hansen

Copyright © 2010 Rochelle E. Tractenberg et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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