Anaplastic lymphoma kinase positive histiocytosis presenting as hemocytopenia in an infant. Issue 3 (2nd October 2022) - Wang, Wenqian; He, Lejian; Wu, Runhui; Yao, Jiafeng; Ma, Honghao; Cheng, Xiaoling; Wei, Ang; Lian, Hongyun; Wang, Dong; Li, Zhigang; Wang, Tianyou; Zhang, Rui