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Table 1 Personally identifiable information used to generate the hash tokens

From: Establishing a framework for privacy-preserving record linkage among electronic health record and administrative claims databases within PCORnet®, the National Patient-Centered Clinical Research Network

Token

Personally identifiable information used

Token 1

Last name + First initial of first name + Gender + Date of birth

Token 2

Last name (soundex) + First name (soundex) + Gender + Date of birth

Token 3

Last name + First name + Date of birth + 3-digit zip code

Token 4

Last name + First name + Gender + Date of birth

Token 5

Social security number + Gender + Date of birth

Token 6

Social security number + First name