>Is there any reason to suppose that blood type plays a role?
Yes. https://academic.oup.com/jme/article/41/4/796/885285
Hardly conclusive, but there is some reason to suspect it plays a role.
Yes. https://academic.oup.com/jme/article/41/4/796/885285
Hardly conclusive, but there is some reason to suspect it plays a role.