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Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Summary of prepaid expenses and other current assets
   December 31,   December 31, 
   2018   2017 
Prepaid insurance  $339,336   $72,371 
Prepaid clinical trial expenses   171,128    226,997 
Other prepaid expenses   105,758    139,954 
Total prepaid expenses and other current assets  $616,222   $439,322