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In September 1994, a conference was held in Oslo, Norway bringing together international researchers in multiple sclerosis epidemiology. The conference heralded the beginning of a 9-month symposium on the etiology of multiple sclerosis (MS) at the Centre for Advanced Study at the Norwegian Academy of Science and Letters in Oslo, Norway. During the conference, investigators from around the world summarized the state of the art of the epidemiology of MS with respect to its geographic distribution, environmental factors, genetic factors, and infectious agents. The proceedings of the conference have been published elsewhere (Acta Neurol Scand 1995;91[suppl 161]).
As the conference progressed, it became clear that the time had come to review the etiologic research carried out to date with the purpose …
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