Observation of vitamin D levels in the patients with chronic obstructive pulmonary disease and obstructive sleep apnea hypopnea syndrome
YANG Hai-hua1, LONG Feng1, ZHU Ning1, ZHANG Xia1, LI Shan-qun2,3*
Observation of vitamin D levels in the patients with chronic obstructive pulmonary disease and obstructive sleep apnea hypopnea syndrome
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