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.

Example Input: Abstract: In search of a practical biochemical test that will reflect hepatic steatosis, we assessed the significance of serum cholinesterase activity in 48 patients with nonalcoholic fatty liver, 16 obese subjects without fatty liver, 30 cases of chronic persistent hepatitis, 38 cases of chronic active hepatitis, and 20 cases of liver cirrhosis. Increased cholinesterase activity was observed in nonobese as well as obese patients with fatty liver, whereas obese subjects without fatty liver showed levels in the upper normal range. When we set a cutoff level above the upper normal limit, half of the patients with fatty liver showed values above it, with only a few overlaps with other patients. When obese patients with fatty liver took a low-caloric diet, cholinesterase activity decreased, clearly reflecting improvement of hepatic steatosis. Thus, measurement of cholinesterase activity is of diagnostic value and an alternative to computed tomography in hepatic steatosis, and will provide a practical measure for the assessment of effects during follow-up.
Example Output: Cholinesterases

Example Input: Abstract: Pyomyositis occurred in a man who had not been to the tropics. The condition is common in the tropics but most unusual in temperate climates and is nearly always caused by Staphylococcus aureus. Pyomyositis must be borne in mind in obscure cases of sepsis, as early recognition and treatment are essential to prevent a fatal outcome.
Example Output: Abscess

Example Input: Abstract: Cowden disease (multiple harmartoma syndrome) is of particular interest because the diagnostic mucocutaneous findings are coupled with a striking association of thyroid cancer, breast cancer, and polyposis of the gastrointestinal tract. We report a case of Cowden disease with particular emphasis on the natural history of the case. Although our case is the second reported with colon carcinoma, the absence of adenomatous polyps in other reports of Cowden disease and the stability of the gastrointestinal polyps in our patient over a seven-year period lead us to conclude that the risk of gastrointestinal malignancy is very low.
Example Output:
Adenocarcinoma