In assessing cases in 5-year periods over 15 years, we observed an increasing trend in the absolute number of patients with NIE; the 1st, 2nd, and 3rd period contained 27, 37, and 57 cases, respectively ( Fig. 1 ).
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In assessing cases in 5-year periods over 15 years, we observed an increasing trend in the absolute number of patients with NIE; the 1st, 2nd, and 3rd period contained 27, 37, and 57 cases, respectively ( Fig. 1 ).