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
CJCP . 2014, (9): 883 -886 .  DOI: 10.7499/j.issn.1008-8830.2014.09.003