Metin Akgun1, Elif Yilmazel Ucar2, Omer Araz2, John E Parker3. 1. Department of Pulmonary Diseases, School of Medicine, Ataturk University, Erzurum, Turkey. Electronic address: akgunm@gmail.com. 2. Department of Pulmonary Diseases, School of Medicine, Ataturk University, Erzurum, Turkey. 3. Pulmonary and Critical Care Medicine Section, West Virginia University, Morgantown, WV.