id	keyword
ejop-668	school
ejop-668	educational
ejop-668	self
ejop-668	children
ejop-668	elementary
ejop-668	measurement
ejop-668	esteem
ejop-668	mood
ejop-668	luxembourg
ejop-668	psychology
ejop-668	grade
ejop-668	year
ejop-668	german
ejop-668	sample
ejop-668	level
ejop-668	study