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63 patients (26 placebo, 37 diflunisal) remained on drug for 24 months. Analyzable primary outcome data were obtained on 60 of these patients (23 placebo, 37 diflunisal); 3 placebo patients had inadmissible NIS+7 data. Study drug was discontinued prior to 24 months in 67 patients (40 placebo, 27 diflunisal); 24 month primary outcome data (NIS+7) were obtained on 8 of these patients (5 placebo, 3 diflunisal).
