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 Shanghai, China 
Author Affiliations: Division of Pediatric Hematology-Oncology, Xinhua Hospital, Shanghai Children's Medical Center, Shanghai Second Medical University, Shanghai 200127, China (Wang YP) Corresponding Author: Yao-Ping Wang, MD, Division of Pediatric Hematology-Oncology, Xinhua Hospital, Shanghai Children's Medical Center, Shanghai Second Medical University, Shanghai 200127, China (Tel: 86-21-58732020; Fax: 86-21-58393915; Email: ypwangscmc@online.sh.cn)
	
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