“…In Denmark, Fog and Wilbek (1974) reported that the annual incidence in the capital city was two, while that in provincial towns and rural districts it was five per 100000, but found no significant excess among agricultural workers. In West Germany, Buss and Dörken (1975) found that communities of more than 50 000 inhabitants showed about half the incidence found in smaller communities, and that there were comparatively low rates in industrialized regions and big cities. Among regions, Saarland showed the lowest, and Bavaria the highest incidence.…”