Definition: Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.
Input: Abstract: Medium-depth chemical peeling of the skin is an intermediate procedure between superficial trichloroacetic acid application and deep phenolic cauterant application. Combining solid carbon dioxide with trichloroacetic acid promotes both epidermal and dermal regeneration. The technique for treatment of actinic degeneration, acne scarring, rhytids, and pigmentary aberrations is presented.
Output:
Adult