This class of statements, or rhetoric generalizations which cannot be read as a logical statement (where 'only ever' is strict), should be avoided. False universal statements add nothing to the style - they may easily detract -, they are gratuitous, they are offensive, and technically they clash with the requirement of respect which seems to be implicit in the guidelines.

I can reassure you: yes, some of us wondered of what could have been the chance that blood circulation affecting diseases may have impacted, and also of the chances of other factors, and also of the weakness of such estimations, and finally of the limited time these vague thoughts deserve.