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To the Editor: I read a reply from Dr. F. Wolfe1. I did not misunderstand. I understand that modification of the American College of Rheumatology (ACR) preliminary diagnostic criteria for fibromyalgia (FM) are not the ACR criteria. I did not state that the modification of the ACR preliminary criteria were the ACR criteria1. Dr. Wolfe, et al stated as follows: ACR preliminary diagnostic criteria for FM in 2010 eliminated the tender point examination, thus making it possible to study FM in survey and clinical research2. A modification to the ACR criteria will allow their use in epidemiologic and clinical studies …

Purpose and Significance of the 2010 Criteria and Modification of the 2010 Criteria for Fibromyalgia