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  1. pdfRapid Acquisition of Pre- and Post-Incident Disaster Data Study 
    https://disasterinfo.nlm.nih.gov/...ol_v8.0_2015-07-16_508_CLEAN.pdf
    ... analysis of samples unless the analysis yields an abnormal value. 4.1.5 Registry Duration and Contact ... may be collected for preservation of white blood cells. Leukocyte viability is maintained at ambient temperature for up ...