_dta:
  1.  by Jean Roth , jroth@nber.org , 19 Apr 2019
  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_Apr_2019.zip
  5.  Source Text File: npidata_pfile_20050523-20190407.csv*

  obs:     2,723,863                          
 vars:             2                          20 Apr 2019 20:50
 size:    81,715,890                          (_dta has notes)
------------------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
------------------------------------------------------------------------------------------
npi             str10   %10s                  National Provider Identifier (NPI)
pmailfax        str20   %20s                  Provider Business Mailing Address Fax Number
------------------------------------------------------------------------------------------
Sorted by: npi