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    Call center agents (1)
    Call centers (1)
    Computer use (1)
    Computer vision syndrome (1)
    Dissertation (M. Optometry (Optometry))--University of the Free State, 2017 (1)
    Ergonomics (1)
    Lighting (1)
    Musculoskeletal symptoms (1)
    Ocular symptoms (1)
    Prevalence (1)