Please assess the completion status of the following clinical trial:

Trial Title: Endometrial Injury and Single Embryo Transfer

Study Design Characteristics:
- Allocation: NON_RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* woman age under 35 years~* history of primary infertility~* normoresponder (antral follicle count 5-10 in one ovary in early follicular phase~* having grade I or II embryos for transfer~* agree to undergo endometrial biopsy during the COH cycle. All patients were stimulated with luteal phase long protocol.~Exclusion Criteria:~* endocrinopathies (including diabetes mellitus, hyperprolactinemia, Cushing's disease, and congenital adrenal hyperplasia), any systemic disease, collagen disorder, hypercholesterolemia, sickle cell anemia, and a history of neoplasm; -high risk for or history of OHSS~* using any concurrent medication (e.g., insulin-sensitizing drugs, and GnRH antagonists)~* patients who did not proceed to follicle retrieval~* severe male infertility requiring TESA/TESA~* mullerian tract anomalies~* a history of endometrial instrumentation or surgery within a month of the study~* not agree to undergo endometrial biopsy during the COH cycle.

- Gender: FEMALE
- Minimum Age: 18 Years
- Maximum Age: 35 Years
- Healthy Volunteers: t

Study Arms:
- Endometrial injury (Type: EXPERIMENTAL): The patients in this group will be subjected to endometrial injury procedure in preceding IVF cycle.
- No endometrial injury (Type: NO_INTERVENTION): The patients in this group will not be subjected to endometrial injury procedure in presiding IVF cycle. The patients will be stimulated with standard IVF protocol.

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