[Age factors in myasthenia gravis: comparison of cases with the first onset prior to age 50 and over 50].
D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000473:pathology; D009157:Myasthenia Gravis / Q000453:epidemiology* / Q000473:pathology