_dta:
  1.  by Jean Roth , jroth@nber.org , 25 Dec 2014

  obs:     4,050,641                          
 vars:             3                          25 Dec 2014 19:44
 size:   137,721,794                          (_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         str20   %20s                  Provider License Number
---------------------------------------------------------------------------------------------------------
Sorted by:  npi  seq