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Three compact discs (CDs A, B, and C) consisting of the same 20 EMG videos and 4 dummy EMG videos were sent to 3 blinded electromyographers, who were given a month to review each CD. One month after each CD was returned, the subsequent CD was mailed. A brief clinical history and examination was provided only with CD-C. Each electromyographer recorded his interpretation on a standard EMG data sheet (appendix e-1).
