Evaluation of students' mental and social health promotion educational programs: A systematic review.

J Educ Health Promot · 2019 · PMC6967152 · PMID 32002430

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an increasing trendno p-value reported

Interest in the subject of the schools’ mental and social health has started since 1963, and its seriousness has had an increasing trend since the WHO's guidelines in 1994.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.