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

  obs:     2,727,202                          
 vars:             3                          25 Dec 2014 14:36
 size:    92,724,868                          (_dta has notes)
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              storage   display    value
variable name   type    format     label      variable label
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npi             str10   %10s                  National Provider Identifier (NPI)
seq             float   %9.0g                 # of Provider License Number in NPPES file
plicnum         str20   %20s                  Provider License Number
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Sorted by:  npi  seq