Coverage of school health monitoring systems in China: a large national cross-sectional survey by Xiaojin Yan, PhD candidate, Peijin Hu, PhD, Ning Ma, MS, Dongmei Luo, MS, Jingshu Zhang, MS, Junyi Wang, PhD candidate, Yanhui Dong, PhD, Yi Xing, PhD, Yi Song, PhD, Jun Ma, PhD, George C Patton, MD, Susan M Sawyer, MD

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