title: Impairment of Concept Formation Ability in Children with ADHD: Comparisons between Lower Grades and Higher Grades.
authors.affiliation: Department of Psychiatry, College of Medicine, Yeungnam University, Daegu, Korea.
authors.forename: Hye Jeong
authors.initials: HJ
authors.lastname: Hong
authors.forename: Jong Bum
authors.initials: JB
authors.lastname: Lee
authors.forename: Jin Sung
authors.initials: JS
authors.lastname: Kim
authors.forename: Wan Seok
authors.initials: WS
authors.lastname: Seo
authors.forename: Bon Hoon
authors.initials: BH
authors.lastname: Koo
authors.forename: Dai Seg
authors.initials: DS
authors.lastname: Bai
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Jeong