1 “... recommendation. DATA EXTRACTION: Data were abstracted to data collection forms. Studies were graded according...”

2 “... reviewed. METHODS: All studies were reviewed, abstracted and rated in quality; only studies of good or fair...”

3 “... recommendation. DATA EXTRACTION: Data were abstracted to data collection forms. Studies were graded according...”

4 “... reviewed. METHODS: All studies were reviewed, abstracted and rated in quality; only studies of good or fair...”

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