不幸的是，这种想法非常的缺乏前瞻性。
但一直缺乏关于前哨淋巴结转移随机临床试验的前瞻性数据。
Prospective data on clinical outcomes from randomized trials according to sentinel-node involvement have been lacking.
目的：产前吸烟与儿童行为问题的关系已经在学龄儿童和更大的儿童中做了研究，但是还缺乏在更小的儿童中做的前瞻性研究。
Objective: The relation between prenatal smoking and child behavioral problems has been investigated in children of school age and older, but prospective studies in younger children are lacking.
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