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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parentheticals) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Preferred stock issuance costs | $ 9,122 |  |
Emerald financing issuance costs | 154,092 | 154,092 |
Convertible multi-draw credit agreement issuance costs |  | 53,707 |
Value of warrants issued to purchase shares of common stock for consulting services |  |  | $ 30,000
Preferred deemed dividend |  |  | 1,044,000
Proceeds from convertible issuance costs | $ 9,301 |  |
Series D Preferred Stock |  |  |
Preferred deemed dividend |  |  | 536,000
Series F Preferred stock |  |  |
Preferred deemed dividend |  |  | 333,000
Series C Preferred Stock |  |  |
Preferred deemed dividend |  |  | $ 175,000

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