Rt Hon JACINDA ARDERN: According to the information that I have from the Ministry of Health, of course, there's the Bluetooth function, and then there is the QR code, which we also use for notifications. I understand that since Tuesday, 17 August, when we had case A first identified, QR notifications had been sent to more than 3,900 devices that had scanned a QR code at a location of interest in the relevant time frame. So you can see it is something that we've used, but, of course, it's reliant on people using it and scanning in wherever they go, in order for us to send those notifications out. For Bluetooth, so far fewer than 10 notifications have been activated or sent, and, again, that will just simply be reliant on how many people have activated Bluetooth on their phones. However, we continue to train public health unit staff in the use of Bluetooth as part of contact tracing and so on, and I understand that 330,000 app users enabled Bluetooth tracing since 17 August. The one final thing I would say is that it is one-way. So our contact tracers don't get people's information, because of privacy reasons. We don't get the information. So we still undertake contact tracing exercises so that we can follow up with people and ensure they are getting tested. These are additional layers that help us, but they don't necessarily give us all of the certainty we would like when we're contact tracing, because of those privacy reasons and the way they're used.