NDEs have a lot more subtle elements than many people think. They include the not ready message, shown predictions of the future, shown a chronological life review that starts at birth, life changing effects(the problem that most explanations don't work against), xenoglossy, . If you want to test, for example, "lack of oxygen", you should put a control group of people without oxygen and put an experimental group of people with actual NDEs. Make sure that the people do not know anything about NDEs. Afterhand, check on the effects of both groups.
More evidence is here:
http://www.near-death.com/science/research/science.html and here:
http://www.near-death.com/science/evidence.htmlI doubt that people who say that experts on quantum physics say that this is purely a woo know much about quantum physics themselves. Furthermore, they are making that claim without evidence in first place.