Figure 1

Study areas. I, Gochon-eup; II, Gimpo-dongs (Gimpo 1-dong, Gimpo 2-dong, Sau-dong, and Pungmu-dong); III, Yangchon-myeon; IV, Daegot-myeon; V, Tongjin-myeon; VI; Wolgot-myeon; and VII, Haseong-myeon. ( ) indicates the positivity rate of IFAT.