1 Department of Public Health, Beer-Sheva, Israel.
2 Department of Medicine, Beer-Sheva, Israel; Faculty of Health Sciences, Ben-Gurion University of the Negev and Soroka University Medical Center, Beer-Sheva, Israel.
3 Department of Pulmonology, Beer-Sheva, Israel; Department of Pulmonology, Beer-Sheva, Israel; Faculty of Health Sciences, Ben-Gurion University of the Negev and Soroka University Medical Center, Beer-Sheva, Israel. Electronic address: nimrod@bgu.ac.il.