心房颤动的发生常有其基础病因和促发因素。

The attack of AF has its fundamental cause and trigger.

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目的探讨早发冠心病患者的危险因素特点。

Objective to investigate the risk factors of patients with premature coronary heart disease.

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目的：探寻肿瘤低发区胃癌的危险因素和保护因素。

Objective To find risk and protective factors in a low epidemic area of tumour.

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目的：探寻肿瘤低发区胃癌的危险因素和保护因素。

Objective To find risk and protective factors in a low epidemic area of tumour.

youdao