Thank you very much for your comment, even you leave unnamed.
I am curious to see the links you wrote, I wonder there are such sites.
I read the Bible descriptions thoroughly as to blood or blood related prohibition. But it's hard to find the relation between its description and their attitude to blood transfusion.
I imagined they think it's oppotunity for them to show their faith whether to accept or refuse blood transfusion.
It is their freedom for them to make the most of its oppotunity in the case of adults who can decide what they are eager to do, but it remains questionable in the case of teen-agers who cannot do what they want if they are opposed by their parents who happened to have different views from them.