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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2017
Preferred stock issuance costs | $ 16,901 |
Issuance costs from convertible multi-draw credit agreement | $ 9,301 | $ 154,092
Value of warrants issued to purchase shares of common stock for consulting services |  | 30,000
Preferred deemed dividend |  | 1,044,000
Series D Preferred Stock |  |
Preferred stock issuance costs |  | 183,343
Preferred deemed dividend |  | 536,000
Series F Preferred stock |  |
Preferred stock issuance costs |  | 118,855
Preferred deemed dividend |  | 333,000
Series C Preferred Stock |  |
Preferred deemed dividend |  | $ 175,000

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