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Arch Pediatr Adolesc Med. 1999;153:92.

	Since this article does not have an abstract, we have provided the first 81 words of the full text and any section headings.

The article by Malloy et al¹ in the August 1998 issue of the ARCHIVES that looks at preceptor expectations and student performance is interesting and useful.

However, a technical error in the recommendations in Table 4, page 809, should be corrected. Lead and erythrocyte protoporphyrin levels should not be determined on serum samples. Because almost all of both substances are carried on or in the erythrocytes, whole-blood specimens should be tested.^2-3

George J. Cohen, MD
11539 Cushman Rd
Rockville, MD 20852

1. Malloy MH, Perkowski L, Callaway M, Speer A. The relationship between preceptor expectations and student performance on 2 pediatric objective structured clinical examination stations. Arch Pediatr Adolesc Med. 1998;152:806-811. FREE FULL TEXT 2. Behrman RE. Nelson Textbook of Pediatrics. 14th ed. Philadelphia, Pa: WB Saunders Co; 1992:1788. 3. Centers for Disease Control. Preventing Lead Poisoning in Young Children. Atlanta, Ga: Centers for Disease Control; 1991:48.