Brian,
Well, I'll go back in my (snow) cave here in PA.

However, you need to appreciate my impression that you are *sounding* a lot like my *former* dentist. I used to work with a psychologist who always said (I don't know where it came from) "Oh for the gift of the gazer, to see ourself as others see us."
I can, however appreciate your concern for your list's integrity. You've put a lot of work into this list, and it's invaluable to a lot of us.
Now, I also understand "hypothesis" and have had some graduate level classes in statistics. My frustration is with people who shut doors, rather than figuring out how to explore the possiblities. I can't see how difficult it would be to do a stasitical analysis, at least, of other factors, especially if you're a doctor who sees new head and neck cancers every day. How did it happen that
HPV was identified as a risk factor?