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Expression of the HPV L1 gene. a Copy number of the L1 gene in specimens with different CIN grades. Statistical analysis was performed using a Steel–Dwass test. ** indicates p < 0.01. b Copy number of L1 gene in specimens with HPV16, 18, 52, and 58 infection. Statistical analysis was performed using a Steel–Dwass test. ** indicates p < 0.01. c Detection rate of L1 gene in each genotype stratified by CIN grade. Statistical analysis was performed using a Cochran-Armitage test
