* 1. a pre-covid-19 history of cognitive dysfunction, or chronic fatigue 2. exclude recurrent episodes of depression (allowed: a prior episode but completed medication at least 3 months before enrollment) 3. any medical or psychiatric condition which could confound study assessments 4. stroke within the last 3 months 5. developmental delay 6. any other condition that the investigator feels would pose a significant hazard to the patient if enrolled 7. current participation in any interventional research study 8. unable to return for follow-up visits for clinical evaluation, laboratory studies, or imaging evaluation

* 1. a pre-covid-19 history of cognitive dysfunction, or chronic fatigue 2. exclude recurrent episodes of depression (allowed: a prior episode but completed medication at least 3 months before enrollment) 3. any medical or psychiatric condition which could confound study assessments 4. stroke within the last 3 months 5. developmental delay 6. any other condition that the investigator feels would pose a significant hazard to the patient if enrolled 7. current participation in any interventional research study 8. unable to return for follow-up visits for clinical evaluation, laboratory studies, or imaging evaluation

1. a pre-covid-19 history of cognitive dysfunction, or chronic fatigue 2. exclude recurrent episodes of depression (allowed: a prior episode but completed medication at least 3 months before enrollment) 3. any medical or psychiatric condition which could confound study assessments 4. stroke within the last 3 months 5. developmental delay 6. any other condition that the investigator feels would pose a significant hazard to the patient if enrolled 7. current participation in any interventional research study 8. unable to return for follow-up visits for clinical evaluation, laboratory studies, or imaging evaluation

1. a pre-covid-19 history of cognitive dysfunction, or chronic fatigue 2. exclude recurrent episodes of depression (allowed: a prior episode but completed medication at least 3 months before enrollment) 3. any medical or psychiatric condition which could confound study assessments 4. stroke within the last 3 months 5. developmental delay 6. any other condition that the investigator feels would pose a significant hazard to the patient if enrolled 7. current participation in any interventional research study 8. unable to return for follow-up visits for clinical evaluation, laboratory studies, or imaging evaluation