P1591: IMPACT OF COVID-19 ON THE EVOLUTION OF PRE-EXISTING PRIMARY IMMUNE THROMBOCYTOPENIA: A PROSPECTIVE OBSERVATIONAL STUDY oleh Haixia Fu, Zhuo-Yu An, Qiu-Sha Huang, Ye-Jun Wu, Feitong Meng, Song Wang, Chengjie Feng, Keting Tong, Yue Jing, Yimeng LI, Xueqi LI, Menglin LI, Mengyu Xiao, Yuxiu Chen, Chen Zhao, Jianying Zhou, Xiao-Hui Zhang, Xiao-Jun Huang