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21.Daum KM, Clore KA, Simms SS, et al. Productivity associated with visual status of computer users. Optometry. 2004 Jan;75(1):33-47.
21.Daum KM, Clore KA, Simms SS, et al. Productivity associated with visual status of computer users. Optometry. 2004 Jan;75(1):33-47.