dr oksa na, jason asks and get some more of these.etres. yes. to start with the second half of the question, the a nswer second half of the question, the answer is a little more straightforward, in terms of air conditioning, heaters, there is no evidence to substantiate that this could be a huge play in terms of the additional risks. as has already been mentioned, really the best precaution is around ensuring essential and basic hygiene. in terms of our use of face mask, we do see that the language from the who has slightly changed from only recommending it for front line health care workers, where it it is absolutely most essential, as we already discussed, these are the people who are front line, conducting these aerosol generating procedures and they require very specific masks. now, for other people also in the public and they would like to use a mask, we see other countries are starting to also slightly move in that direction, with the general public using facemasks, however, it is so important that we don‘t have this false sense