1. Department of Pathobiology and
2. Department of Basic Sciences, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran
3. Department of Pulmonary Medicine, Division of Internal Medicine, the University of Texas M. D. Anderson Cancer Center, Houston, Texas
4. Department of Pulmonology, Leiden University Medical Center, Leiden, the Netherlands; and
5. Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands