RT Article T1 Recent trends in violence-related behaviors among high school students in the United States JF The journal of the American Medical Association / Englische Ausgabe VO 282 IS 5 SP 440 OP 446 A1 Brener, Nancy D. LA English YR 1999 UL https://krimdok.uni-tuebingen.de/Record/1639669302 K1 Gewalt K1 Schule K1 Waffenbesitz K1 USA