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MYASTHENIA GRAVIS Osserman and Genkins Classification ADULT MG (90％)Ⅰ:Ocular (20％)ⅡA:Mild Generalized (30％)ⅡB:Moderate Generalized (20％)Ⅲ:Acute fulminating (11％)Ⅳ:Late severe (9％)MGFA classification Class Ⅰ:Any eye muscle weakness,possible ptosis,Class Ⅱ:Mild weakness of other muscles,may have eye muscle weakness Ⅱa:Predominantly limb or axial muscles or both Ⅱb:Predominantly oropharyngeal or respiratory muscles or both