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What is the resurgence of rickets?

While once thought to be eradicated in many developed countries, the incidence of nutritional rickets has risen dramatically in recent years, with one study showing a surge from 2.2 per 100,000 children in the 1980s to 24.1 per 100,000 in the 2000s in one US county alone. The comeback of this ancient disease raises the pressing question: what is the resurgence of rickets and what factors are responsible?