[lemma=the] [lemma=issue] [lemma=discuss] [□=□]
[lemma=the] [lemma=issue] [lemma=discuss] [tag=□]
[lemma=the] [lemma=issue] [lemma=discuss] [lemma=□]
The issue discussed the most in the work group was the efficacy of chelation therapy , and the blood lead level above which chelation is appropriate .