Szukana fraza: [Abstract = "Problem behaviours, in spite of their evolving nature, often influence physical and mental health of young people in a very negative way. Aggressiveness, experimenting with narcotic drugs or alcohol use by school students is becoming a great social problem. The knowledge of protective factors and risk factors, and their interaction provides the basis for the development of effective methods of reducing risk behaviours during puberty."]

Wyników: 1