Modification by Influenza on Health Effects of Air Pollution in Hong Kong. - Wong, Chit Ming; Yang, Lin; Thach, Thuan Quoc; Chau, Patsy Yuen Kwan; Chan, King Pan; Thomas, G. Neil; Lam, Tai Hing; Wong, Tze Wai; Hedley, Anthony J.; Peiris, J. S. Malik (Environmental Health Perspectives, 2009)