Current state of knowledge and gaps in experimental evidence related to the physiologic role and toxicity of trace elements in human health were presented and discussed at an international joint conference in Hersonissos, Crete-Greece, in October 2007. The conference (ISTERH/NTES/HTES '07) constituted the VIIIth Conference of the International Society for Trace Element Research in Humans (ISTERH), the IXth Conference of the Nordic Trace Element Society (NTES), and the VIth Conference of the Hellenic Trace Element Society (HTES). The focus of the conference is put on the topics:

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