I'll be brief. Thank you very much.
To my knowledge, there has not been a head-to-head comparison. Of course, we can talk about data, but we can also talk about public health practice in a time of great uncertainty with potentially dangerous variants of concern circulating and about precedents set by other countries. While I can't look you in the eye and tell you with a straight face the true incremental of added safety, I would say that it certainly adheres to fundamental public health principles to add additional layers of safety where you can to protect yourself from an unknown threat, and then rapidly pivot as you gain and gather that data that would really help inform your next best move.