ioannidis, i tried to synthesize data on the outset. some of which is was yours i know you recently updated your data and shared that with a medical journal. what is it that has changed? and what is it that you want the audience to know about your reeveryone? >> thank you for the opportunity to discuss that. as you know the study on prevalence is one many of studies to discuss the how freak the frequency of covid-19 is in the general population. we've received an enormous amount, constructive comments from many colleagues, both myself and our team are very grateful nofor that. we have updated the paper with far more data, far more negative controls to minimize the uncertainty of the tests used. and analysis and thinking that might affect the results. and also an improved, enhanced method to try to reduce and calculate the uncertainty around the estimates that we get. there is also still very robust the confusion that is that based on what we see, this infection is very common. it's far more common compared to what we saw, based on the d