J64, O15, O33, D83, J68, C93, D91, J24, O12
I23, I24, D83, D47, C93
I21, I23, J24, D83, O33
J24, M53
and Effects of Psychological, Emotional, Social, and Cognitive Factors. I21 — Analysis of Education.
I24
C93, D91, J24
C93, D83, I22, I24
M53 ; J24; C93
I21, C93, I28, J24