Methods A cross section study.
方法现况研究。
In addition, this article probes into limitations and development of balanced cross section study.
另外,本文还对平衡剖面技术的局限性和发展趋势进行了探讨。
Methods Cross section study was employed for malaria cases investigation, vectors survey and its distribution.
方法调查各县(市)疟疾发病情况及当地传播媒介种类和分布规律。
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