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The Anatomical Therapeutic Chemical (ATC) classification system
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Level 4
S - Sensory organsS01 - OphthalmologicalsS01K - Surgical AidsS01KA - Viscoelastic substances
S01KA01 - Hyaluronic AcidS01KA02 - HypromelloseS01KA51 - Hyaluronic Acid, combinations
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