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PITX2, IVS3AS, A-G, -11

National Institutes of Health

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2014
2014
目的了解中国不同城市和农村3~11岁儿童的铁缺乏及贫血现况,并探讨相关影响因素。方法采用多阶段分层随机整群抽样方法在北京、沈阳、苏州、郑州、成都、兰州和广州等7个城市和河北省两个乡镇(平原、山区)各随机抽取1个幼儿园和1…