This advice was given by a medical specialist who provides first aid training to several reputable airlines and their crews (both cabin and cockpit).
would be interesting to see his evidence, as obviously this has major implications, if it were backed up by robust trial dat. (I doubt it is).
Without wishing to elicit any angry responses from our more passionate contributors, it's interesting to note, that in the big scheme of evidence based medicine, specialist advice alone rates pretty low.