Iompaseo,
Well i'm getting a bit fed up with telling people why they are seriously ill after a few years flying jets - the aviation doctors can't seem to work it out, whilst the specialists are just about to prove it - beyond reasonable doubt.
Both can't be right.
Ask Boeing, they have worked it out.
I'm so pleased that you don't appear to suffer (are you sure?), but just try to think of others....
DB