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: Ninety-four cases of percutaneous tracheostomy and six cases of percutaneous cricothyroidotomy are reported in this study. There was one death attributable to the use of the device. A complication rate of 14% is reported. Clinical use for the adult and pediatric patient is reported. The procedure is compared to the standard dissection tracheostomy method of Chevalier Jackson. This procedure has several advantages over the standard dissection method, the most significant of which appears to be the speed with which it can be performed. It can be done in 30 seconds, as opposed to the dissection procedure which requires 3 minutes or more for a surgeon to complete it. Autopsies on 14 of these patients are discussed. Long-term followup, that is for 1 year and more, is reported in 19 cases. Advantages of the percutaneous technique over the standard dissection technique are detailed.
Example Output: Adolescence

Example Input: Abstract: Release of prostaglandin E (PGE) was examined in leukocyte cultures from patients with definite MS who had had at least one recent exacerbation, others with chronic progressive or stable MS, and healthy controls. MS patients had higher baseline levels of PGE than did controls. Patients with active symptoms exhibited a sharp increase in PGE release early in or just before the onset of clinical symptoms. Levels dropped early in exacerbation immediately after the burst in PGE synthesis activity. Values gradually increased to control levels and then to preexacerbation levels. Similar rises and falls were not seen in stable MS. MS patients may have a circulating population of activated leukocytes that produce PGE.
Example Output: Acute Disease

Example Input: Abstract: At the University of Texas Medical School at Houston we had a unique opportunity to examine performance through the medical curriculum and one year of postgraduate training of 50 students initially rejected for medical school. Each had been interviewed by the same Admissions Committee, which earlier had selected 150 students through the traditional process. In contrasting the initially accepted and initially rejected groups, academic and demographic variables accounted for only 28% of group difference. The 72% of group difference not accounted for by the variables examined was presumed to relate to Admissions Committee preference. In attrition and in both preclinical and clinical performance through medical school and one year of postgraduate training, there were no meaningful differences between the groups. The observations suggest that the traditional interview process probably does not enhance the ability to predict performance of medical school applicants.
Example Output:
Achievement