Twin studies of disease concordance are useful to weight the relative contribution of genetic and environmental factors to the cause of common complex disorders. In multiple sclerosis (MS) different twinning rates from geographic areas at different prevalence suggested that heritable and non-heritable factors contribute in different proportions and ways to MS risk in diverse populations.
Background. The term "dual diagnosis" (DD) has been used in clinical practice for years. However, there is confusion about these medical cases, which consist in the presence of both a psychiatric disorder and a substance abuse disorder (in this case, alcohol). There are evidences that in the alcohol use disorder (AUD) population, 50.3% of patients had a psychiatric comorbidity during their lifetime. Nevertheless, to these days there are not any thorough guidelines for the management of these patients.
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