The per-protocol analysis of 69 ( 79 % ) patients revealed complete epithelialisation before day 75 in 15 ( of 23 ; 65 % ) patients of Group I , in 23 ( of 23 ; 100 % ) patients of Group II , and in 20 ( of 23 ; 87 % ) patients of Group III ( p = 0.004 , Fisher 's Exact Test ) .