That link didn't work in mozilla :-(
At a glance it looks like they screwed up and forgot the content-type header. Through Google I was able to find and read the cached version, and it answered why they currently exist, not why they used to.
However a bit of Googling around found [link|http://www.intelihealth.com/IH/ihtIH/WSIHW000/35320/35323/361888.html?d=dmtHMSContent|http://www.intelihea...l?d=dmtHMSContent] which told me that I was repeating a common myth. What I said about the health effects of RH factor is not a myth, but that it was the reason for introducing blood tests was.
Mea culpa. Live and learn. Etc.
Ben
"good ideas and bad code build communities, the other three combinations do not"
- [link|http://archives.real-time.com/pipermail/cocoon-devel/2000-October/003023.html|Stefano Mazzocchi]