CJCP     2019 21 (5):  415-420    ISSN: 1008-8830  CN: 43-1301/R Langerhans cell histiocytosis involving the oral and maxillofacial region: an analysis of 12 cases WANG Ying-Chao, LI Zhuang-Zhuang, YIN Chu-Yun, JIANG Lan-Jun, WANG Long Department of Pediatric Hematology and Oncology, First Affiliated Hospital, Zhengzhou University, Zhengzhou 450052, China Received: 2018-12-13  Revised: null  Online: null Supporting info null