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Multiple mediation model of the total effect (c) of shift work on influenza-like illness/acute respiratory infection (ILI/ARI) incidence rate, the indirect effects of sleep (a1-3, b1-3), physical activity (a4-5, b4-5), and diet (a6-7, b6-7), and the direct effect of shift work (c’) on ILI/ARI incidence rate.
