*From QualityMetric, Inc, Lincoln, Rhode Island. †From the Health Assessment Lab, Boston, Massachusetts. ‡From the National Institute of Occupational Health, Copenhagen, Denmark. Preparation of this article and data collection costs for the 1999 National Headache Impact Survey were supported by Glaxo Wellcome. Address correspondence to: John E. Ware, Jr, PhD, QualityMetric, Inc, 640 George Washington Hwy, Lincoln, RI 02865. E-Mail: [email protected]
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