本文作者认为Ｍａｓｏｎ等人直接比较我们与他们的工作是不可能的，因为铅（Ｐｂ）暴露浓度有差别。他们曾测定胫骨Ｐｂ，此外我们的对象主要暴露于镉。Ｍａｓｏｎ等人提出了两个独立的观点，第一是关于血铅与血浆１，２５－二羟维生素Ｄ之间的关系，第二是提出在设想来源于成 The author of the paper thinks it is impossible for Mason et al. To directly compare us with their work because there is a difference in lead (Pb) exposure concentrations. They had measured the tibia Pb, and in addition our subject was mainly exposed to cadmium. Mason et al. Put forward two independent views. The first one is about the relationship between blood lead and plasma 1,25-dihydroxyvitamin D, and the second one is proposed in the hypothesis that