<qa>  How many days does Tf-CRM107 take?- Group 1 ages 5-9: Patients receive intratumoral Tf-CRM107 over 3-7 days via catheter. Treatment repeats after 6-10 weeks in the absence of unacceptable toxicity. Three cohorts of 3-6 patients receive escalating doses of Tf-CRM107 until the maximum tolerated dose MTD is determined. 