Effects of personal air pollutant exposure on oxidative stress: Potential confounding by natural variation in melatonin levels - He, Linchen; Cui, Xiaoxing; Xia, Qianyi; Feng Li; Mo, Jinhan; Gong, Jicheng; Yinping Zhang; Zhang, Junfeng (International Journal of Hygiene and Environmental HealthInternational Journal of Hygiene and Environmental Health, 2020)