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Natl Hlth Insurance Serv, Hlth Insurance Res Inst, 2 Segye Ro, Wonju 26464, South Korea
Seoul Natl Univ, Grad Sch Publ Hlth, 1 Gwanak Ro, Seoul 08826, South Korea Natl Hlth Insurance Serv, Hlth Insurance Res Inst, 2 Segye Ro, Wonju 26464, South Korea