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: Recent evidence shows tetracyclines have anticollagenolytic activity that may be clinically effective in disease treatment. This led us to use systemic tetracycline (oral tetracycline hydrochloride 1 g daily divided into 4 doses) as adjunctive therapy in treating 18 patients with persistent corneal epithelial defects. Fourteen of 18 patients healed their defects; within 48 hours (9 patients) and within two weeks (the other 5 responding patients). Two patients showed no effect and two showed disease progression.
Example Output: Adolescence

Example Input: Abstract: Any fall in the elderly may signal impending major illness. Falls may be caused by any acute or chronic illness that causes weakness or dizziness. MI, stroke, or GI bleeding may well present with falls. A fall can be the first sign of urinary tract, respiratory, or gallbladder infection. Avoid open-ended questions, such as "What happened?" Patients often state they slipped or tripped--possibly not the true reason for the fall. Direct questions about symptoms ("Did you have difficulty in walking?" or "Did you feel dizzy?") elicit more specific information.
Example Output: Accidental Falls

Example Input: Abstract: We observed a case of skin avulsion associated with measurement of blood pressure by oscillometry on an anesthetized patient in the prone position. Epidermal shearing may be avoided in the prone patient by either wrapping the antecubital skin underlying the blood pressure cuff with gauze or preventing weight-bearing by the cuffed portion of the arm.
Example Output:
Blood Pressure Determination