re neck ring removal 

I removed this sentence from the "Body alteration" section:
'''The rings stretch the vertebrae and if the neck rings are removed, the neck muscles can no longer support the weight of the head and collapse."
for a couple of reasons:
It's uncited and disputed. See here.
Disputed or not, it's a level of detail beyond what's appropriate for this article, which covers a very broad concept. It's more appropriate being described in the Neck ring article, or at most in the Body alteration article.