Gender and age characteristics: among 159 cases, 82 cases were male and 77 cases were female, the ratio of male to female was 1.06:1; 74 cases (46.6%) were ≤ 3 months old; 39 cases (24.5%) were 3-6 months old, 15 cases (9.4%) were 6-1 years old, 31 cases (19.5%) were > 1 years old.<br>
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