Sleep Disorders Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran; Department of Clinical Biochemistry, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran. Department of Clinical Biochemistry, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran; Department of Clinical Biochemistry, Faculty of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran. Cardiovascular Diseases Research Centre, Department of Cardiology, Birjand University of Medical Sciences, Birjand, Iran. Cardiovascular Diseases Research Centre, Department of Biochemistry, Birjand University of Medical Sciences, Birjand, Iran. Electronic address: chamani.ec@gmail.com. Department of Clinical Biochemistry, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran. Department of Clinical Biochemistry, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran. Electronic address: Fallah.s@iums.ac.ir.