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Various sources say 5 to 10 micrograms/deciliter of blood is the usual point of concern. In adults symptoms show up at around 60. Children are developing so the lower 5 is recommended as their ma...
Answer
Various sources say 5 to 10 micrograms/deciliter of blood is the usual point of concern. In adults symptoms show up at around 60. Children are developing so the lower 5 is recommended as their ma...