Clinical Characteristics and Prognosis of 45 Patients with Late-onset Myasthenia Gravis 
XIA Chun-feng1,ZHAO Yan-jun1,ZHANG Jun2,LIU Gang3,ZHANG Yue-qi4*
Chinese General Practice . 2018, (20): 2516 -2520 .  DOI: 10.3969/j.issn.1007-9572.2018.00.167