1Osserman KE,Genkins G. Studies in myasthenia gravis:review of a twenty - year experience in over 1200 patients. Mt sinai J Med,1971,38(6) :497 -537.
2Pescarmona E, Rendina EA,Venu ta F, et al. Analysis of prognostic factors and clinicopathelogical staging of thymoma. Ann Thorac Surg,1990,50(4):534-538.
3Masaoka A,Monden Y. Comparison of the results of transsternal simple,transcervical simple and exetnded thymectomy.Ann NY Acad Sci,1981,377 :755 -65.
