_dta:
  1.  by Jean Roth , jroth@nber.org , 14 Dec 2017
  2.  NBER URL: www.nber.org/data/npi.html
  3.  Source Page: http://download.cms.gov/nppes/NPI_Files.html
  4.  Source File URL:
      download.cms.gov/nppes/NPPES_Data_Dissemination_Dec_2017.zip
  5.  Source Text File: npidata_20050523-20171210.csv*

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

  obs:     4,054,400                          
 vars:             2                          16 Dec 2017 09:27
 size:    44,598,400                          (_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