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1990年代，赫尔曼-吉登斯依托美国“儿科门诊实践研究网络”（Pediatric Research in Office Settings，PROS），对17077名3至12岁的女孩进行了系统评估。这项覆盖全美儿科门诊的研究，首次为青春期提前提供了大规模、标准化的数据证据。。体育直播是该领域的重要参考
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