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General and Administrative Expenses (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Salaries and social welfare | $ 761,774 | $ 1,765,019 | $ 805,048
Service fee | 12,369 | 41,437 | 84,445
Office expense |  | 1,960 | 7,302
Stock compensation | 69,176 | 247,134 | 479,233
Travel Expense | 4,848 | 42,656 | 35,438
General and administrative expenses | 2,593,808 | 3,675,465 | 3,192,030
General and administrative expenses [Member] |  |  |
Salaries and social welfare | 1,358,629 | 1,068,643 | 862,660
Service fee | 750,734 | 1,493,403 | 915,228
Office expense | 268,555 | 391,850 | 388,751
Research & Development |  | 301,713 | 344,575
Depreciation &Amortization | 138,811 | 79,177 | 31,739
Stock compensation | 69,176 | 247,134 | 479,233
Entertainment fee | 4,176 | 22,593 |
Travel Expense | 1,056 | 17,902 | 75,080
Others | 2,671 | 53,050 | 94,764
General and administrative expenses | $ 2,593,808 | $ 3,675,465 | $ 3,192,030

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