Nothing New
The study presents nothing new...east is least..west is best and so on.
What needs to be investigated are the affects of cortisol on the pre frontal lobe and the changes in blood viscosity and the related reduction in the oxygen carrying function of blood.
Lack of oxygen to the brain, in particular,causes the death of cells.
There is also evidence to suggest that the cabin crew population has a greater incidence of certain types of cancer:
In particular ..breast cancer in women and testicular cancer in men.
Brain tumours are also relatively high amongst long serving longhaul crews.
Airlines have never been forthcoming with the information they have regarding the detrimental affects of flying on the human body.
Nor have Cabin crew unions for that matter.The information would be used to limit the flying careers of everyone to about five years.
In the mean time we are treated like mushrooms..kept in the dark and fed on bull****e