[1] Korea Inst Radiol & Med Sci, Natl Radiat Emergency Med Ctr, Lab Low Dose Risk Assessment, Seoul 01812, South Korea
[2] Pusan Natl Univ, Dept Biol Sci, Busan, South Korea
[3] Seoul Natl Univ, Sch Pharm, Seoul, South Korea
[4] Sookmyung Womens Univ, Dept Biol Sci, Seoul, South Korea
[5] Chonnam Natl Univ, Dept Vet Anat, Coll Vet Med, Gwangju, South Korea
[6] Chonnam Natl Univ, PLUS Project Team BK21, Gwangju, South Korea
[7] Korea Inst Radiol & Med Sci, Dept Pathol, Korea Canc Ctr Hosp, Seoul, South Korea