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The Anatomical Therapeutic Chemical (ATC) classification system
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Level 4
V - VariousV09 - Diagnostic radiopharmaceuticalsV09E - Respiratory SystemV09EX - Other respiratory system diagnostic radiopharmaceuticals
V09EX01 - Krypton (81mKr) gasV09EX02 - Xenon (127Xe) gasV09EX03 - Xenon (133Xe) gas
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