1 Infectious Disease Unit, Specialty Internal Medicine, Johns Hopkins Aramco Healthcare, Dhahran, Saudi Arabia.
2 Division of Infectious Diseases, Indiana University School of Medicine, Indianapolis, IN, USA.
3 Division of Infectious Diseases, Johns Hopkins University, Baltimore, MD, USA.
4 King Saud Medical City, Ministry of Health, Riyadh, Saudi Arabia.
5 Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA.
6 Al-Faisal University, Riyadh, Saudi Arabia.
7 Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands.
8 WHO Collaborating Centre for Travellers' Health, Institute for Epidemiology, Biostatistics and Prevention, University of Zürich Centre for Travel Medicine, MilMedBiol Competence Centre, University of Zürich, Switzerland.