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[null,"Table 1. Patients' clinicopathological characteristics (n = 41)"]
[]
[{"$nulls":3},"(n)"]
["　","Age (years)\n median 60.0\n (range 28-85)","<50",10]
["　",null,"≥50",31]
[null,"Tumour size (mm)\n (range 10-43 mm)","10≤, <20",21]
[null,null,"20≤, <30",8]
[null,null,"30≤",12]
[null,"Lymph node\n metastasis","negative",25]
[null,null,"positive",16]
[null,"Stage",1,17]
[null,null,"2A",14]
[null,null,"2B",9]
[null,null,"3A, B",0]
[null,null,"3C",1]
[null,null,4,0]