Please assess the completion status of the following clinical trial:

Trial Title: The Effects of Laxative-probiotic Sequential Treatment in the Irritable Bowel Syndrome Patients

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE1
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* the presence of Rome III criteria for IBS ;~* Patients scheduled for colonoscopy examination or having negative screening examinations~* Aged between 18 and 65 years old~Exclusion Criteria:~* Antibiotic, probiotic or laxative usage within 4 weeks.~* organic gastrointestinal diseases~* Severe systematic disease: diabetes mellitus, hepatic, renal or cardiac dysfunction, thyroid disease or tumor etc.~* pregnancy or lactation.~* previous major or complicated abdominal surgery.~* severe endometriosis and dementia

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 65 Years
- Healthy Volunteers: f

Study Arms:
- laxative-probiotic sequential (Type: EXPERIMENTAL): laxative：2000 ml. Probiotic：2 tablets/ times, 3 times / day for the first 2 weeks，immediately after colonoscopy
- probiotic (Type: ACTIVE_COMPARATOR): Probiotic：2 tablets/ times, 3 times / day for the first 2 weeks.
- Laxative followed by Probiotic 2 weeks later (Type: ACTIVE_COMPARATOR): laxative：2000 ml. Probiotic：2 tablets/ times, 3 times / day for the last 2 weeks with two weeks interval after colonoscopy.

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