Correlation of BMI and Serum 25(OH)D Levels with Advanced Bone Age in Children from Northwestern China: A Cross-Sectional Study

Tingting Li, Nan Nan, Wenjie Wei, Yin Zhu, Lei Huang, Xuerong Ma, Yongxia Du, Naqi Zhang, Dandan An, Wenjie Bai, Hongyan Fan, Chen Wang, Zhenqiang Da, Xingwen Xie