Please assess the completion status of the following clinical trial:

Trial Title: Oral Sulfate Solution (SUPREP) Versus Polyethylene Glycol (PEG) Plus Ascorbic Acid

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: DIAGNOSTIC
- Time Perspective: None
- Masking: SINGLE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* people who receive colonoscopy~* aged : 18-80~* people who sign the consent~Exclusion Criteria:~* those aged over 80 years~* the disabled~* intestinal obstruction~* severe constipation~* previous history of bowel resection~* liver cirrhosis~* heart failure or ischemic heart disease within 6 months~* inflammatory bowel disease~* pregnant women~* severe renal insufficiency~* people who refuse to sign the consent

- Gender: ALL
- Minimum Age: 19 Years
- Maximum Age: 80 Years
- Healthy Volunteers: t

Study Arms:
- Oral sulfate solution (OSS) (Type: EXPERIMENTAL): oral sulfate solution (OSS)
- 2-L PEG/Asc (Type: ACTIVE_COMPARATOR): low-dose polyethylene glycol plus ascorbic acid (2-L PEG/Asc)

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