I know that the World Health Organization is actively in China looking at the evidence. That is a very key piece of evidence that we are trying to ascertain. We do know something about coronaviruses, given that we've had other coronaviruses that cause anything from a mild illness through the common cold all the way to a more severe end of the spectrum such as SARS, the coronavirus and MERS, or Middle East respiratory syndrome coronavirus. Based on what we know about those coronaviruses, is it possible that an asymptomatic person could transmit the virus? Even if it's possible, it is, we believe, a rare event. It is not that type of transmission that drives the force of an epidemic.
I think we have to be reasonable in our public measures and just balance out the risks and benefits. In terms of the impacts, they are not simply health impacts, but psychological and other health impacts, as well as non-health impacts, those being societal and economic as well. It's something that we're pursuing very actively with the World Health Organization. They know they have to get to the bottom of this, but we do know that even people with mild symptoms don't transmit very readily. Could they? It's possible, but that's not what drives an actual epidemic.