More on children's bullying.
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D015746:Abdominal Pain / Q000209:etiology / Q000451:nursing*; D000374:Aggression / Q000523:psychology*; D002648:Child; D006801:Humans; D011602:Psychophysiologic Disorders / Q000209:etiology / Q000451:nursing*; D012573:School Nursing; D013334:Students / Q000523:psychology*