W.-W. Zhang

[Joint effects of short term exposure to heat and ozone on circulatory disease mortality in Beijing-Tianjin-Hebei region and surrounding areas].

[Association of exposure to fine particulate matter and its components with frailty in middle-aged and older adults in Beijing-Tianjin-Hebei region and surrounding areas].

[Analysis on prevalence of sleep disturbance in 4 151 outpatients with chronic pain and mediating effect of depressive symptoms].

The prevalence of sleep disturbance was high in outpatients with chronic pain in Beijing, Jiangxi, and Chongqing and was associated with pain severity and might be also indirectly associated with pain severity through depressive symptoms.