Corrections and clarifications.

In Table 1 of the article ("Serum Dioxin Concentrations and Endometriosis: A Cohort Study in Seveso, Italy") by Eskenazi et al. [EHP 110:629-634 (2002)], two values for Zone B (row 2) were reported incorrectly. The value for total study participants (third column) should be 504 instead of 540, and the value for "Uncertain" (fifth column) should be 255 instead of 225.

In "A New Mechanism for DNA Alterations Induced by Alpha Particles Such as Those Emitted by Radon and Radon Progeny," by Lehnert and Goodwin [EHP 105(suppl 5):1095-1101 (1997)], Alina Deshpande was acknowledged for her technical assistance. More appropriately, she should have been included as a co-author of the article. The authors regret this oversight.

In "Health Effects Assessment for Environmental Perchlorate Contamination," by Greer et al. [EHP 110:927-937 (2002)], the triangle and diamond symbols in the key were transposed. The figure appears here correctly. EHP regrets the error.

In the September Focus article, "Economy and Environment: China Seeks a Balance" [EHP 110:A516-A522], part of the last paragraph was inadvertently omitted. The final paragraph should have read:

   Ultimately, Western governments and industries would be wise to help China
   on its path to a cleaner environment. As an enticement, the market
   opportunities are potentially huge. And with nearly a quarter of the
   world's population affected, the consequences of success or failure will be
   truly global.

EHP regrets the error.

[FIGURE 6 OMITTED]