Previous studies of our group found association of haplotypes in the IL8 and in the CXCR2 genes with the multifactorial disease chronic periodontitis .
O O O O O O O O O O O B-GeneOrGeneProduct O O O B-GeneOrGeneProduct O O O O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O