CJCP     2014 16 (9):  883-886    ISSN: 1008-8830  CN: 43-1301/R Relationship between serum 25-hydroxyvitamin D and bone mineral density in children under 7 years old XIONG Fei, YANG Fan, YANG Su-Fei, WU Kang-Min Department of Pediatrics, West China Second University Hospital, Chengdu 610041, China Received: 2014-01-10  Revised: 2014-03-22  Online: null Supporting info null