Association of residential greenness with obstructive sleep apnea among Chinese old adults and the mediation role of PM2.5 and leisure-time physical activity - Xueru Duan; Wenjing Zhao; Boyi Yang; Lixian Lao; Yunting Mei; Chuchu Wu; Yifu Liao; Yongqi Wang; Zuyi Feng; Weiqing Chen; Erjia Ge; Hai Deng; et al. (Science of The Total Environment, 2024)