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_descriptionOptional
descriptionHuman readable description
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extensionAdditional content defined by implementations
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idUnique id for inter-element referencing
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modifierExtensions that cannot be ignored even if unrecognized
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noteUsed for footnotes or explanatory notes
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quantityUsed to express the observation at a defined amount of time after the study start
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rangeUsed to express the observation within a period after the study start
Human readable description