Premise: Based on GAO's work, HCFA now requires states to investigate serious complaints alleging harm to residents within 10 days, has proposed an expansion of its enforcement programs by subjecting homes with repeated serious deficiencies to immediate sanctions, and has revised the protocols that state surveyors use to inspect nursing homes to better focus the reviews.

Hypothesis: GAO's work looks at HCFA and its enforcement programs.
Relation: entailment