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• There must be at least one arm/group that implies that the entire study subject population receives the same intervention.

• The number of arms/groups added to the trial must coincide with the number indicated in the trial’s Design Details. See Abstracting Interventional Trial Design Details.

• Every arm must have at least one assigned intervention (except for the arm type "no intervention").
• Every intervention must be assigned to at least one arm.
• There must be only one arm with the same combination of description and associated intervention.
• Arm details for single-arm trials are not required.

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