A questionnaire for multinational case–control studies of environmental risk factors in multiple sclerosis (EnvIMS‐Q)

The increasing incidence of multiple sclerosis (MS) worldwide, especially in women, points to the crucial role of environmental and lifestyle risk factors in determining the disease occurrence. An international multicentre case–control study of Environmental Risk Factors In Multiple Sclerosis (EnvIMS) has been launched in Norway, Sweden, Italy, Serbia and Canada, aimed to examine MS environmental risk factors in a large study population and disclose reciprocal interactions. To ensure equivalent methodology in detecting age‐related past exposures in individuals with and without MS across the study sites, a new questionnaire (EnvIMS‐Q) is presented.

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