University of Cambridge - Department of Genetics, Independent, University of Texas at Austin, The University of Hong Kong - WHO Collaborating Centre for Infectious Disease Epidemiology and Control, Ewha Womans University - Department of Health Convergence, National University of Singapore (NUS) - Saw Swee Hock School of Public Health, The University of Hong Kong - WHO Collaborating Centre for Infectious Disease Epidemiology and Control, The University of Hong Kong - WHO Collaborating Centre for Infectious Disease Epidemiology and Control and University of Cambridge - Department of Genetics