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4. Accounts receivable (Tables)
3 Months Ended
Mar. 31, 2016
Receivables [Abstract]  
Accounts Receivable
   

March 31,

2016

  December 31, 2015
    Unaudited    
Treatment program   $ 263,793     $ 183,582  
Allowance for doubtful accounts     —         —    
    $ 263,793     $ 183,582