Supplementary Methods from Quantifying the Activity of Adenoviral E1A CR2 Deletion Mutants Using &lt;i&gt;Renilla&lt;/i&gt; Luciferase Bioluminescence and 3′-Deoxy-3′-[&lt;sup&gt;18&lt;/sup&gt;F]Fluorothymidine Positron Emission Tomography Imaging