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["Table 2. Recurrence disease of NB during maintenance treatment"]
["Time point of recurrence ",null,"Total cases (n=36)"]
["with 13-cis-retinoic acid",null,31]
[null,"the first-three months",5]
[null,"next 6-9 months",26]
["after 13-cis-retinoic acid stopped",null,5]
[null,"3-6 months",2]
[null,"6-12 months",2]
[null,"Over 12 months",1]

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