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6. Prepaid Expenses (Tables)
3 Months Ended
Mar. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of prepaid expenses

Prepaid expenses consist of the following:

 

    March 31,     December 31,  
    2019     2018  
Prepaid insurance costs   $ 14,461     $ 28,751  
Prepaid employee benefits     11,822       11,865  
Prepaid office and other costs     74,118       13,319  
Total prepaid expenses   $ 100,401     $ 53,935