3 Dept of Internal Medicine, International Medical University of Kyrgyzstan, Medical Center of the Kyrgyz State Medical Academy, named after I.K. Ahunbaev, Bishkek, Kyrgyzstan.
4 National Pirogov Memorial Medical University, Vinnytsia, Ukraine.
5 State Institution Dnipropetrovsk Medical Academy of the Ministry of Health of Ukraine, Dept of Occupational Diseases and Clinical Immunology, Dnipro, Ukraine.