Please assess the completion status of the following clinical trial:

Trial Title: Specialized Pacing for Patients With Congenital Heart Disease

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE2/PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Congenital heart disease~  • Simple, moderate, or complex congenital heart disease~* Adolescent or adult age group (age \>14 and \<65 years)~* Significant sinus node dysfunction~  * Atrial pacing percentage \>70%11~ * Intrinsic dysfunction resulting from congenital lesion or cardiac surgery~ * Secondary sinus node dysfunction due to antiarrhythmic drug therapy~* Existing, fully functional pacemaker or ICD with CLS capability~* Epicardial or transvenous route of pacemaker implantation~Exclusion Criteria:~* Unable to complete cardiopulmonary exercise testing (CPET)~* Contraindication to CPET~* Decreased mental capacity or known psychiatric disorder~* Congestive heart failure, NYHA cass IV~* Total atrial tachyarrhythmia burden \>20%

- Gender: ALL
- Minimum Age: 14 Years
- Maximum Age: 65 Years
- Healthy Volunteers: f

Study Arms:
- CLS-On (Type: EXPERIMENTAL): Subjects in this arm will be programmed to CLS-on to received closed loop stimulation-based pacing for 3 months, followed by a standard rate response for 3 months.
- CLS-Off (Type: ACTIVE_COMPARATOR): Subjects in this arm, will be placed in a standard rate response for 3 months, followed by CLS-on to received closed loop stimulation-based pacing for 3 months.

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