Estimating the exposure-response function between long-term ozone exposure and under-5 mortality in 55 low-income and middle-income countries: a retrospective, multicentre, epidemiological study - Xue, T; Wang, R; Tong, M; Kelly, FJ; Liu, H; Li, J; Li, P; Qiu, X; Gong, J; Shang, J; Zhu, T (The Lancet Planetary Health, 2023)