1 Department of Internal Medicine Donetsk National Medical University Lyman, Ukraine profnbg@ukr.net Unit of Internal Medicine, Infectious Diseases, and Dermatovenereology Institute of Postgraduate Education of Bogomolets National Medical University Kyiv, Ukraine Department of Internal Medicine Donetsk National Medical University Lyman, Ukraine Unit of Internal Medicine, Infectious Diseases, and Dermatovenereology Institute of Postgraduate Education of Bogomolets National Medical University Kyiv, Ukraine.