Please assess the completion status of the following clinical trial:

Trial Title: Clinical and Pharmacogenetic Study of Attention Deficit With Hyperactivity Disorder (ADHD)

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: BASIC_SCIENCE
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* ADHD~Exclusion Criteria:~* Psychosis~* Tourette syndrome~* Intelligence quotient (IQ) \< 70~* Pervasive developmental disorder (PDD)

- Gender: ALL
- Minimum Age: 6 Years
- Maximum Age: 12 Years
- Healthy Volunteers: f

Study Arms:
- Ritalin (Type: ACTIVE_COMPARATOR): None
- Placebo (Type: PLACEBO_COMPARATOR): None

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