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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2011
Accounts Receivable  
Schedule of Accounts Receivable
     June 30, 2011     December 31, 2010  

Gross accounts receivable

   $ 677,558      $ 603,372   

Allowance for contractual adjustments and uncollectibles

     (483,526     (421,977
                
   $ 194,032      $ 181,395