2,355 words – 23 scientific references

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3,001 words – 17 scientific references

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2,676 words – 22 scientific references

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2,599 words – 29 scientific references

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2,636 words – 28 scientific references

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2,321 words – 32 scientific references

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2,388 words – 29 scientific references

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2,434 words – 17 scientific references

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2,538 words – 22 scientific references

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