In the article “Circulating Irisin in Relation to Insulin Resistance and the Metabolic Syndrome” by Kyung Hee Park, Lesya Zaichenko, Mary Brinkoetter, Bindiya Thakkar, Ayse Sahin-Efe, Kyoung Eun Joung, Michael A. Tsoukas, Eleni V. Geladari, Joo Young Huh, Fadime Dincer, Cynthia R. Davis, Judith A. Crowell, and Christos S. Mantzoros (J Clin Endocrinol Metab; 2013, 98:4899–4907; doi:10.1210/jc.2013-2373), the printer made an error when parsing the first author's name for PubMed. The correct last name is Park, and the first name is Kyung Hee, so in PubMed and Endnotes the correct name should be Park, KH. The printer apologizes for the error.