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

pgender:
  1.  M, Male
  2.  F, Female

  obs:     3,545,778                          
 vars:             2                          21 Nov 2015 11:29
 size:    39,003,558                          (_dta has notes)
-------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-------------------------------------------------------------------------------
npi             str10   %10s                  National Provider Identifier
                                                (NPI)
pgender         str1    %9s                 * Provider Gender Code
                                            * indicated variables have notes
-------------------------------------------------------------------------------
Sorted by:  npi