Fisman David N, Leung Gabriel M, Lipsitch Marc
Dalla Lana Faculty of Public Health, University of Toronto, Toronto, ON, Canada M5T 3M7.
Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong Special Administrative Region, China.
Lancet. 2014 Jan 18;383(9913):189-90. doi: 10.1016/S0140-6736(13)62123-6.