Applying the International Classification of Headache Disorders to the Emergency Department: An Assessment of Reproducibility and the Frequency With Which a Unique Diagnosis Can Be... by Friedman, Benjamin W., MD, MS, Hochberg, Michael L., MD, Esses, David, MD, Grosberg, Brian, MD, Corbo, Jill, MD, Toosi, Babak, MD, Meyer, Robert H., MD, Bijur, Polly E., PhD, Lipton, Richard B., MD, Gallagher, E. John, MD

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