Figure 2From: Timeliness of national notifiable diseases surveillance system in Korea: a cross-sectional study Median time lags between the time points of surveillance. DOH, Department of Health (at the provincial level); HFRS, Hemorrhagic fever with renal syndrome; KCDC, Korea Centers for Disease Control and Prevention (at the central level); PHC, Public Health Centers (at the local level). See Figure 1 for definitions of T2, T3, and T4.Back to article page