The research, published in international journal Archives of Pediatrics and Adolescent Medicine, polled students aged 13 to 17 in 1999 who were followed up five years later.

 
  • 该项在《儿科与青少年医学档案》国际期刊上发表的调查开始于1999年,调查对象为13岁至17岁的中学生,他们接受了为期五年的跟踪调查。
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