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[{"arm_notes": null, "treatment_id": 406, "treatment_name": "Diltiazem", "treatment_type": "Cardiovascular agents", "pharmacological_treatment": "Pharmacological treatment"}, {"arm_notes": "", "treatment_id": 2187, "treatment_name": "Placebo", "treatment_type": "Placebo", "pharmacological_treatment": "Placebo"}]