Case Report: SLC52A2 variants cause Brown-Vialetto-Van Laere syndrome type 2, characterized by pure red cell aplastic anemia: clinical and genetic features of three Chinese children

病例报告：SLC52A2 变异导致布朗-维亚莱托-范莱尔综合征 2 型，其特征为纯红细胞再生障碍性贫血：三名中国儿童的临床和遗传特征