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%The Stokes-Einstein-Debye equation \cite{VanHolde1998} assumes that the solvent containing the rotating particles is homogeneous and continuous. Although this may not always be the case, the approximation seems to be valid for proteins which are generally much larger than the solvent molecules.\cite{Weber1953}  The measurement time interval of 5~$\mu$s used in these experiments is ideal for measuring the rotational correlation times of these proteins with this Ru dye at low viscosities. However, with the long lifetime of the dye, long pixel dwell times are needed, making scanning-based data acquisition slow. Recently developed wide-field lifetime imaging approaches \cite{Hirvonen2014_ol, Hirvonen2015_njp} \cite{Hirvonen2014_ol,Hirvonen2015_njp}  that are ideally suited for measuring lifetimes at this time scale, and could image several wells containing different drugs and/or different viscosity solutions simultaneously, might benefit the size measurement of similar or higher MW drugs.