These devices are generally considered safe in themselves, though there can be significant financial and opportunity costs to magnet therapy, especially when treatment or diagnosis are avoided or delayed. The worldwide magnet therapy industry totals sales of over a billion dollars per year,<ref name=FlammCSI2006></ref><ref name=BBC2006></ref> including $300 million per year in the United States alone.<ref name="Finegold"></ref>  A 2002 U.S. National Science Foundation report on public attitudes and understanding of science noted that magnet therapy is "not at all scientific."<ref name="mag_NSF"> "Among all who had heard of [magnet therapy], 14 percent said it was very scientific and another 54 percent said it was sort of scientific. Only 25 percent of those surveyed answered correctly, that is, that it is not at all scientific."</ref> A number of vendors make unsupported claims about magnet therapy by using pseudoscientific and new-age language. Such claims are unsupported by the results of scientific and clinical studies.<ref name=Livingston1998></ref>  Marketing of any therapy as effective treatment for any condition is heavily restricted by law in many jurisdictions unless all such claims are scientifically validated. In the United States, for example, U.S. Food and Drug Administration regulations prohibit marketing any magnet therapy product using medical claims, as such claims are unfounded.<ref></ref>    </doc> <doc id="75920" url="https://en.wikipedia.org/wiki?curid=75920" title="John Byrne (comics)"> John Byrne (comics)  John Lindley Byrne (; born July 6, 1950)<ref name="CBG"></ref> is a British-born American<ref name=citizenship></ref> writer and artist of superhero comics. Since the mid-1970s, Byrne has worked on many major superheroes, with noted work on Marvel Comics' "X-Men" and "Fantastic Four" and the 1986 relaunch of DC Comics' "Superman" franchise, the first issue of which featured comics' first variant cover. Coming into the comics profession as penciller, inker, letterer and writer on his earliest work, Byrne began co-plotting the "X-Men" comics during his tenure on them, and launched his writing career in earnest with "Fantastic Four" (where he also served as penciler and inker). During the 1990s he produced a number of creator-owned works, including "Next Men" and "Danger Unlimited".