[1] Aristotle University of Thessaloniki,Department of Oral Surgery, Surgical Implantology and Oral Radiology, School of Health Sciences, School of Dentistry
[2] 424 General Military Training Hospital,Department of Dentistry
[3] Democritus University of Thrace,Department of Pneumonology, Medical School
[4] Democritus University of Thrace,MSc Program in Sleep Medicine, Medical School
[5] Aristotle University of Thessaloniki,Department of Respiratory Failure, General Hospital “G. Papanikolaou”
[6] Aristotle University of Thessaloniki,Department of Oral Medicine/Pathology, School of Dentistry