Clinical Research Directory

Inclusion Criteria, just one of the following: * Long COVID-19 defined by NIH PASC criteria OR * Acute COVID-19 who tested positive for COVID-19 without persistent symptoms OR * Postural orthostatic tachycardia syndrome (POTS) OR * Diabetic neuropathy Exclusion Criteria: * Clinical evidence of severe peripheral vascular disease * History of ulceration, poor wound healing or vascular claudication * History of allergic reaction to local anesthesia (for biopsy collection) * Use of oral anticoagulants (aspirin or Plavix alone is allowed) * History of a bleeding disorder