I don't see any individual level data for illness duration in the study. Just a mean and range in Table 1. And I don't see anything about NK relationship to duration. Maybe it's from a talk?I'm I'm not misremembering I think the NK cell findings here were somewhat related to illness duration (I'm not actually sure if anyone checked whether the correlation between response and NK count was stronger than response and illness duration), which would make that quite possible (people with long-term illnesses "responding" better for whatever reasons).