_dta:
  1.  by Jean Roth , jroth@nber.org , 21 Nov 2015

  obs:     1,110,356                          
 vars:             2                          21 Nov 2015 10:21
 size:    21,096,764                          (_dta has notes)
-------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-------------------------------------------------------------------------------
npi             str10   %10s                  National Provider Identifier
                                                (NPI)
ein             str9    %9s                   Employer Identification Number
                                                (EIN)
-------------------------------------------------------------------------------
Sorted by:  npi