_dta:
  1.  by Jean Roth , jroth@nber.org , 16 Dec 2017

  obs:     4,862,988                          
 vars:             3                          16 Dec 2017 10:23
 size:   170,204,580                          (_dta has notes)
-------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-------------------------------------------------------------------------------
npi             str10   %10s                  National Provider Identifier
                                                (NPI)
seq             float   %9.0g                 # of Provider License Number in
                                                NPPES file
plicnum         str21   %21s                  Provider License Number
-------------------------------------------------------------------------------
Sorted by: npi  seq