NOTE 8 – STOCK WARRANTS

The following table summarizes information with respect to outstanding warrants to purchase common stock of the Company, all of which were vested and exercisable, at December 31, 2018:

During the year ended December 31, 2017, 225 warrants with an exercise price of $63.00 were exercised. During the year ended December 31, 2018, 108 warrants with an exercise price of $1,200.00 and 9,190 warrants with an exercise price of $425.00 expired. During the year ended December 31, 2017, 3,309 and 4,452 warrants with exercise prices of $2,500.00 and $1,200.00, respectively, expired.