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In the article by Wilhelm and Ritz [Environ Health Perspect 111:207-216 (2003)], a negative sign was omitted from the equation on page 208. The correct equation appears below. EHP regrets the error.

Y = (1 / 0.4 [square root (2[pi])]) x esp [-((0.5)[(D / 500).sup.2] / [(0.4).sup.2])]

Li et al. [EHP 111:455-460 (2003)] would like to thank Arantzazu Eiguren-Fernandez and Antonio H. Miguel of the Southern California Particle Center and Supersite (Los Angeles, CA, USA) for their analyses of polycyclic aromatic hydrocarbons, elemental carbon, and organic carbon reported in "Ultrafine Particulate Pollutants Induce Oxidative Stress and Mitochondrial Damage," published in the April issue of EHP. Their data is a valuable contribution to the article.

In "Atrazine-Induced Hermaphroditism at 0.1 ppb in American Leopard Frogs (Rana pipiens): Laboratory and Field Evidence" by Hayes et al. [Environ Health Perspect 111:568-575 (2003)], Figure 8 was incorrect. The correct figure appears below:

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Publication:Environmental Health Perspectives
Date:May 1, 2003
Previous Article:Comment on "use of A-Bomb survivor studies as a basis for nuclear worker compensation". (Perspectives Correspondence).
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