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Map of fecal sample collection sites in Korea. The regions of sample collection were divided into the northern (Gyeonggi [GG] and Gangwon [GW]), central (Chungnam [CN], Chungbuk [CB], Gyeongbuk [GB], and Jeonbuk [JB]), southern (Gyeongnam [GN], and Jeonnam [JN]), and Jeju (JJ) regions along the administrative district boundaries.
