W. T. Mayr et al. “Incidence and Prevalence of Multiple Sclerosis in Olmsted County, Minnesota, 1985–2000”. Neurology 61, № 10 (2003).
455
C. Green et al. “A Population-based Ecologic Study of Inflammatory Bowel Disease: Searching for Etiologic Clues”. American Journal of Epidemiology 164, № 7 (2006); K. Kimura et al. “Concurrence of Inflammatory Bowel Disease and Multiple Sclerosis”. Mayo Clinic Proceedings 75, № 8 (2000).