A cross-cultural study of possible iatrogenic effects of gifted education programs: tenth graders´ perceptions of academically high performing classmates - Oh, Hyerim; Sutherland, Margaret; Stack, N; del Mar Badia, M; Blumen, S; Nguyen, Quoc Anh-Thu; Wormald, C; Maakrun, J; Ziegler, Albert (High ability studies, 2015)