Fig. 3

Distribution of the samples according to the lesion scores and regions. a represents the number of samples as lesion score 1. b represents the number of samples as lesion score 2. c represents the number of samples as lesion score 3. d represents the number of samples as lesion score 4. The percentage of frequency of lesion score 1 + 2 (discrete to middle) and lesion score 3 + 4 (moderate to severe). "a" denotes a statistically significant difference (p < 0.05; Fisher’s exact test using Yates’ correction) between the regions considering mild score, and "b" denotes a statistically significant difference (p < 0.05; Fisher’s exact test using Yates’ correction) between the regions considering severe scores