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Visit the Electronic Filing PIN Request page on the agency's Web site and supply your Social Security number or taxpayer identification number — as well as your name, date of birth, filing status and the mailing address used for your previous year's return.
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Study Design: We used the 1995 to 1997 matched multiple birth file for United States twin births (n = 269,287).
After all exclusion criteria were applied, the final live birth file had 159,547 live birth records.
The third group consists of children from the general population identified from state birth files.
Data were obtained from the 1) Québec birth file and 2) 2001 Canada census.
Before any restrictions, there were 174,558 records in the live birth file.
The group from the general population was sampled from California state birth files.
We used the matched multiple birth file created by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention [ 15].
Controls were selected from electronic birth files of all children whose place of birth was New York State excluding New York City between 1978 and 2001.
Using birth files from the provincial vital statistics registry, we developed a second cohort consisting of most of their children.
Reported infant deaths and live birth files were used to determine initial numerators and denominators for IMRs.
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