C91, C92, D83, D91, M54
I23, I24, D83, D47, C93
I21, I23, J24, D83, O33
J24, M53
D81, D84, I21, I22, O3
and Effects of Psychological, Emotional, Social, and Cognitive Factors. I21 — Analysis of Education.
D72; D83; H52; H77
C92, D82, D83, M52, C72
I24
C92, D83