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Concentrations
9 Months Ended
Sep. 30, 2015
Notes to Financial Statements  
8. Concentrations

During the three months ended September 30, 2015, two vendors represented 61% and 11% of total inventory purchases, and 67% and 11% of total inventory purchases for the nine months ended September 30, 2015.  During the three months ended September 30, 2014, two vendors represented 76% and 12% of total inventory purchases, and 68% and 14% of total inventory purchases for the nine months ended September 30, 2014.  Two vendors represented 40% and 12% of the accounts payable balance as of September 30, 2015 and 36% and 11% as of December 31, 2014. One customer represented 6% and 22% of the accounts receivable balance as of September 30, 2015 and December 31, 2014, respectively.