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For contributors- A study on the menstruation of Korean adolescent girls in Seoul
- Jin Chul Lee, Byung Keun Yu, Jung Hye Byeon et al.
- Clin Exp Pediatr. 2011;54(5):201-206.
- A study of adolescent smoking and drinking in Korea
- Byung Keun Yu, Yeon Joung O, Jin Chul Lee et al.
- Clin Exp Pediatr. 2009;52(4):422-428.