Intense competition shapes PRK delivery market.
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D003315:Cornea / Q000601:surgery*; D018795:Device Approval / Q000331:legislation & jurisprudence; D006801:Humans; D054018:Lasers, Excimer; D018903:Photorefractive Keratectomy / Q000191:economics*; D012030:Refractive Errors / Q000191:economics; D054140:Refractive Surgical Procedures; D014481:United States; D014486:United States Food and Drug Administration