In 1977, the Watchtower Society produced a definitive 64-page booklet “Jehovah’s Witnesses and the Question of Blood” that covered religious, moral and medical issues.
At the time, I wrote a detailed rebuttal. I have extracted the Chapter that deals with the WTS’s mishandling of medical sources in that booklet.
That Chapter it is available at:
http://www.jwstudies.com/Handling_Medical_Evidence.pdf
Doug