Please select the eligibility criteria that correspond to the clinical trial below.
Title: Effects of a Novel Dietary Supplement on Visual Function in Patients With Diabetes With and Without Early Diabetic Retinopathy
Brief Summary: This study will evaluate the effects of a novel multi-component dietary supplement on the visual function and retinal structure of patients with diabetes with both no diabetic retinopathy and mild to moderate diabetic retinopathy. This is a placebo-controlled trial and neither subjects nor examiners will know if any given subject is taking active supplement or placebo.

The hypothesis is that the supplement will improve visual function and retinal structure in subjects on active supplement


Options:
A: Inclusion Criteria:

* early stages of hypertension (systolic BP ≥ 140 and ≤ 159 mm Hg) and/or diastolic BP: ≥ 90 and ≤ 99 mm Hg
* not receiving BP-lowering medication.
* obtained written informed consent before the initial screening visit.

Exclusion Criteria:

* Body Mass Index (BMI) \> 30 kg/m2
* taking antihypertensive medications
* smoking
* pregnant or who intends to become pregnant
* wife in breastfeeding period
* persons with a self-reported history of clinical cardiovascular disease, cancer, chronic kidney disease (or a serum creatinine ≥ 1.7 mg/dL for men and ≥ 1.5 mg/dL for women) hypercholesterolemia (LDL-c ≤ 189 mg/dL, diabetes mellitus (or serum glucose ≥126 mg/dL), or consumption of more than 14 drinks of alcoholic beverages per week.
B: Inclusion Criteria:

* The patient is between 6-12 years old (both inclusive).
* The patient satisfies the DSM-IV criteria for ADHD or ADD.
* The patient has a responsible caregiver who is able to provide information about the patient's functional status.
* Written informed consent is obtained from the patient and the legally accepted representative.

Exclusion Criteria:

* The patient does satisfy the DSM-IV for autism spectrum disorder.
* The patient does have situational hyperactivity, pervasive developmental disorders, schizophrenia, other psychotic disorders such as mood or anxiety disorder, personality disorder as unsocial behaviour, personality change due to a general medical condition, mental retardation (IQ \< 70), understimulating environments, conduct disorder, chorea and other dyskinesias. The patient does not have tics or Tourette's syndrome, or personal or family history of psychotic disorder, bipolar illness, depression, or suicide attempt.
* The patient does have any chronic medical disorder (diabetes, epilepsy or other seizure disorder, autoimmune disorder, gastrointestinal disorder, renal or cardiovascular disorders, etc.) or acute inflammatory disease. The patient does not have glaucoma, heart disease, heart rhythm disorder, high blood pressure, or peripheral vascular disease such as Raynaud's syndrome.
* The patient did use any of these medications during the 3 months before entering the study: clonidine, guanethidine, blood thinners (e.g. warfarin or Coumadin), antidepressants (e.g. amitriptyline, citalopram, doxepin, fluoxetine, nortriptyline, paroxetine, sertraline), cold or allergy medicine that contains a decongestant, medications to treat high or low blood pressure, seizure medicine (e.g. phenobarbital, phenytoin, primidone), or diet pills.
* The patient did take MAO inhibitor (isocarboxazid, linezolid, phenelzine, rasagiline, selegiline or tranylcypromine) in the past 14 days.
* The patient has any other contraindication for the use of methylphenidate.
* The patient did use vitamin/mineral/herbal/omega-3 supplements or other any medication (psychoactive medication, antibiotics, anti-inflammatory drugs, melatonin, etc.) \> 1 week during the 3 months before inclusion.
C: Inclusion Criteria:

* borderline blood pressure (systolic 130-149)
* homocystein level \>10µmol/l

Exclusion Criteria:

e.g.

* BMI \<20kg/m2 and \>32kg/m2
* use of antihypertensives, anticoagulants, and statins
* cardiovascular diseases e.g. stroke, myocardial infarction
* use of L-arginine and other dietary supplements
D: Inclusion Criteria:

* diabetes mellitus diagnosed at least 5 years
* age greater than or equal to 18 years
* English speaker

Exclusion Criteria:

* proliferative diabetic retinopathy or severe non-proliferative retinopathy
* clinically significant macular edema
* corrected visual acuity less than 20/30 in either eye
* diagnosis of other serious eye disease (glaucoma, age-related maculopathy)
* less than 18 years old
* non-English speaker
* no known allergy or sensitivity to any supplement ingredients

Answer: D