The best replacement for iron overload is hemochromatosis.

The best alternatives to iron overload are rated as following:
★★★★★  hemochromatosis

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Speaking about iron overload, one probably shouldn't forget about thalassemia.

Other search terms related to iron overload and their ratings are:
★★★★★ thalassemia
★★ beta thalassemia
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iron overload
hemochromatosis