We randomly assigned 42 practices to GP triage ( n = 13 ) , nurse triage ( n = 15 ) , or usual care ( n = 14 ) , and 20,990 patients ( n = 6695 vs 7012 vs 7283 ) were randomly assigned , of whom 16,211 ( 77 % ) patients provided primary outcome data ( n = 5171 vs 5468 vs 5572 ) .