There's a strong incentive, if you're going in to hospital with Covid19, to lie. They ask "were you sheltering in place?" and you'd think "if I answer no, will

There's a strong incentive, if you're going in to hospital with Covid19, to lie. They ask "were you sheltering in place?" and you'd think "if I answer no, will I be denied care?". That's going to make survey almost useless, a secondary survey (eg speak to neighbors) might be better but would still be relatively poor.