A: the results of ranking the leading causes of death are subject to the cause categories used.
答：首要死亡原因的排序结果取决于使用的病因分类。
Diseases of the heart in young women account for about 16,000 deaths annually, ranking it among the leading causes of death in this group, according to authors.
作者们称每年死于心脏疾病的年轻女性有16,000，为该年龄组的首要死因。
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