Satellite-based estimates of long-term exposure to fine particles and association with mortality in elderly Hong Kong residents by Wong, CM, Lai, HK, Tsang, H, Thach, TQ, Thomas, GN, Lam, KBH, Chan, KP, Yang, L, Lau, AKH, Ayres, JG, Lee, SY, Chan, WM, Hedley, AJ, Lam, TH