For over two decades, Jancke has researched the effects of music lessons, and like Schellenberg, he believes that the only way to truly understand their effects is to run longitudinalstudies.
Longitudinalstudies are needed to confirm these findings.
另外还需要开展纵向研究来确认这些发现。
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There are very few complex diseases which have been comprehensively analysed, with large scale and longitudinalstudies, like this, said Professor Lloyd.