Again, for under-two-year-olds, 15,000 glue ear operations will be prevented. I hadn't really sort of thought on it before as to that relationship. I knew the relationship existed between smoking and glue ear; not quite sure around the physiology. I mean, how does that work? So I sort of tried to look at it over the past few days. I'm not much clearer other than it seems to be that the cigarette smoke irritates the Eustachian tube, closes it off, pulls the eardrum in, and you get glue building up behind the tympanic membrane, which is sort of the best conclusion I could get to. So that sort of makes sense, and that substantiates the data showing that there is a relationship there. 