THE FREQUENCY AND GEOGRAPHIC DISTRIBUTION OF MULTIPLE SCLEROSIS AS INDICATED BY MORTALITY STATISTICS AND MORBIDITY SURVEYS IN THE UNITED STATES AND CANADA
机构:
Portland VA Med Ctr, Sect Gastroenterol, P3-GI, Portland, OR 97239 USA
Oregon Hlth & Sci Univ, Div Gastroenterol & Hepatol, Portland, OR 97239 USAPortland VA Med Ctr, Sect Gastroenterol, P3-GI, Portland, OR 97239 USA