An interesting article scientifically but of little help to sufferers who still have only an oxygen bottle which is not very compatible with work and other aspects of general life. However, at least the article is up to date, unlike so many that still say for example that painkillers don't work because cluster headaches are over by the time painkillers kick in (my CH attacks last 4 hours or more, easy enough time for a painkiller to begin work but they don't) so one glance at a sentence like that on a page tells me the page is outdated and useless. This page however is up to date. I am still awaiting though, to see info on any page that is fundamentally useful to myself or other sufferers. Until then, I am travelling about with a large bottle of oxygen and missing important meetings at work.