Adding index date section.

ncihtan · Jun 4, 2024 · 9d5681f · 9d5681f
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diff --git a/.DS_Store b/.DS_Store
diff --git a/data_submission/clin_biospec_assay.md b/data_submission/clin_biospec_assay.md
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 # Submitting Assay Data and Metadata

diff --git a/data_submission/dates.md b/data_submission/dates.md
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+order: 995
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+# What is the index date?
+
+HTAN cannot accept dates because they are considered Protect Health Information (PHI). In order to obfuscate dates, they should be converted
+to days from an index date.  In this case, the index date is the participant's date of birth.  For example, a participant's therapy start date 
+would be recorded as 365 days if the therapy took place 365 days after a participant's date of birth.