In a 1998 Journal of American Medical Association paper, Drummond Rennie, an editor at JAMA, and his colleagues found that 11% of a sample of articles published in six major medical journals had been authored or co-authored by someone who is not listed among the writers.
"The man in Canada has a diagnosed medical condition and we need the permission of those treating him to take a DNA sample - to do this we are seeking the assistance of the Canadian authorities, " said Det Supt Langley.