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Serum antibody levels to P. gingivalis GroEL-specific peptide at baseline examination and reassessment. Data are determined by ELISA using synthetic P. gingivalis GroEL-specific peptide as an antigen (box plots show medians, 25th and 75th percentiles as boxes, 10th and 90th percentiles as whiskers. Outside values are shown as open circles). *Significant difference was observed between baseline examination and reassessment (paired t-test, P < 0·0001).
