Please assess the completion status of the following clinical trial:

Trial Title: Examining Cognitive Function and Brain Abnormalities in Adults With Sickle Cell Disease

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: CASE_CONTROL
- Primary Purpose: None
- Time Perspective: CROSS_SECTIONAL
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~Individuals who meet all of the following criteria are eligible for enrollment as cases into the study:~1. Adult between the ages of 21 and 55~2. African descent~3. Proficient/fluent in English~4. Hemoglobin electrophoresis confirming hemoglobin SS or SB0 (%A \<= 15)~5. Hemoglobin \<= 10 g/dL~6. Capable of giving informed consent for the protocol~Individuals who meet all of the following criteria are eligible for enrollment as community controls into the study:~1. Adult between the ages of 21 and 55~2. African descent~3. Proficient/fluent in English~4. Capable of giving informed consent for the protocol~Exclusion Criteria:~Individuals who meet any of the following criteria are disqualified from enrollment in the case group of the study:~1. Overt stroke~2. Previous evidence of an abnormal MRI or CT other than small peri-ventricular or watershed lesions~3. History of head injury that resulted in neurological symptoms or medical visit~4. Abnormal neurologic exam with focal findings~5. Mini-Mental Status Examination (MMSE) score of \< 20~6. Profile of Mood States (POMS) score on the Depression-Dejection Subscale suggestive of a clinical depression (score \> 40)~7. Alcohol consumption exceeding 14 drinks/week if female, 21 drinks/week if male~8. Drug abuse, defined as using non-prescribed medication~9. History of claustrophobia and/or presence of metallic implants such as pacemakers, surgical aneurysm clips, or known metal fragments embedded in the body~10. Pregnancy~11. Baseline blood pressure \> 140/90 on two repeated measurements. A second measurement is needed only if the first is \> 140/90~12. History of uncontrolled hypertension~13. Any chronic disorder that may result in neurocognitive or brain dysfunction that is not secondary to SCD including:~    1. Inflammatory arterial disorders (lupus, polyarteritis)~   2. History of cancer requiring chemotherapy and/or radiation~   3. Untreated hyperlipidemia~   4. Diabetes~   5. Ongoing active infection such as HIV, tuberculosis, sarcoidosis~   6. History of chronic transfusion~   7. Chronic renal failure/Dialysis~   8. Chronic lung disease characterized by need for oxygen~   9. Morbid obesity (weight \>115 kg)~   10. Heart disease: history of congestive heart failure, history of severe coronary artery disease characterized by angioplasty or surgery, or history of angina~   11. Active hepatitis or liver failure~   12. Acquired or congenital immune deficiency~   13. History of psychoses (delusions, hallucinations) and/or schizophrenia~   14. Neurodegenerative disorders~   15. Genetic disorder associated with neurocognitive dysfunction such as Down Syndrome~   16. Other chronic illness or disorder other than SCD that will adversely affect the subject's performance in the study~14. Currently on Procrit or related drug that stimulates red blood cell production~Individuals who meet any of the following criteria are disqualified from enrollment as community controls in to the study:~1. Hb electrophoresis other than AA~2. Abnormal Hb (females: \< 12 g/dL; males: \< 13.5 g/dL)~3. Overt stroke~4. Previous abnormal MRI or CT~5. History of head injury that resulted in neurological symptoms or medical visit~6. Abnormal neurologic exam with focal findings~7. Mini-Mental Status Examination (MMSE) score of \< 20~8. Profile of Mood States (POMS) score on the Depression-Dejection Subscale suggestive of a clinical depression (score \> 40)~9. Alcohol consumption exceeding 14 drinks/week if female, 21 drinks/week if male~10. Drug abuse, defined as using non-prescribed medication~11. History of claustrophobia and/or presence of metallic implants such as pacemakers, surgical aneurysm clips, or known metal fragments embedded in the body~12. Pregnancy~13. Baseline blood pressure \> 140/90 on two repeated measurements. A second measurement is needed only if the first is \> 140/90~14. History of uncontrolled hypertension~15. Any chronic disorder that may result in neurocognitive or brain dysfunction including:~    1. Inflammatory arterial disorders (lupus, polyarteritis)~   2. History of cancer requiring chemotherapy and/or radiation~   3. Untreated hyperlipidemia~   4. Diabetes~   5. Ongoing active infection such as HIV, tuberculosis, sarcoidosis~   6. History of chronic transfusion~   7. Chronic renal failure/Dialysis~   8. Chronic lung disease characterized by need for oxygen~   9. Morbid obesity (weight \> 115 kg)~   10. Heart disease: history of congestive heart failure, history of severe coronary artery disease characterized by angioplasty or surgery, or history of angina~   11. Active hepatitis or liver failure~   12. Acquired or congenital immune deficiency~   13. History of psychoses (delusions, hallucinations) and/or schizophrenia~   14. Neurodegenerative disorders~   15. Genetic disorder associated with neurocognitive dysfunction such as Down Syndrome~   16. Other chronic illness or disorder that will adversely affect the subject's performance in the study~16. Currently on Procrit or related drug that stimulates red blood cell production

- Gender: ALL
- Minimum Age: 21 Years
- Maximum Age: 55 Years
- Healthy Volunteers: t

Study Arms:
- Cases (CLOSED) (Type: None): These are patients diagnosed with sickle cell disease (confirmed by hemoglobin electrophoresis).
- Controls (CLOSED) (Type: None): These are persons that do not have sickle cell disease (confirmed by hemoglobin electrophoresis); matched to cases by age, gender, and education level

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

Answer: outcome: complete