Please assess the completion status of the following clinical trial:

Trial Title: NF1-Attention: Study of Children With Neurofibromatosis Type 1 Treated by Methylphenidate

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: None
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE4
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* Age 7-12 years~* IQ between 80-120.~* Gender: male or female~* Children with neurofibromatosis type 1 (according to the National Institutes of Health \[NIH\] 1988).~* Patients with school difficulties pointed out by parents or teachers~* Patients with attention difficulties as defined by anamnesis~Exclusion Criteria:~* IQ \> 120 or IQ \< 80~* Child depression~* Unwillingness to participate~* Patients with cerebral complication of neurofibromatosis type 1 (chiasma glioma, moya-moya) as detected by cerebral magnetic resonance imaging (MRI).~* Participation in another study

- Gender: ALL
- Minimum Age: 7 Years
- Maximum Age: 12 Years
- Healthy Volunteers: f

Based on this trial design, predict the completion outcome and termination type (if applicable).