1. Mohannad Ramadan, MD, MSc, is a Research Assistant, Department of Pharmacology and Public Health, Faculty of Medicine, The Hashemite University, Zarqa, Jordan.
2. Khalid A. Kheirallah, PhD, is an Associate Professor, Department of Public Health, Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan.
3. Luca Cegolon, MD, MSc, DTM&H, PhD, is a Clinical Lecturer in Public Health Medicine, University of Trieste, Department of Medical, Surgical & Health Science, and a Consultant Medical Epidemiologist, Unit of Occupational Medicine, University Health Agency Giuliano-Isontina; both in Trieste, Italy.
4. Saverio Bellizzi, MD, MSc, PhD, is a Consulting Medical Epidemiologist, Sassari, Italy.