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

  obs:       555,191                          
 vars:             2                          21 Nov 2015 10:18
 size:    16,655,730                          (_dta has notes)
-------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-------------------------------------------------------------------------------
npi             str10   %10s                  National Provider Identifier
                                                (NPI)
aocredential    str20   %20s                  Authorized Official Credential
                                                Text
-------------------------------------------------------------------------------
Sorted by:  npi