Laith J Abu-Raddad1, Nico Nagelkerke. 1. aInfectious Disease Epidemiology Group, Weill Cornell Medical College - Qatar, Cornell University, Qatar Foundation - Education City, Doha, Qatar bDepartment of Healthcare Policy and Research, Weill Cornell Medical College, Cornell University, New York, New York cVaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Centre, Seattle, Washington, USA dDepartment of Public Health, United Arab Emirates University, Al Ain, United Arab Emirates eDepartment of Public Health, Erasmus Medical Center, Rotterdam, The Netherlands.