1. Department of Internal Medicine №1, Gomel State Medical University, Gomel, Belarus
2. Endocrinology Department, Belarusian State Medical University, Minsk, Belarus
3. Department of Faculty Therapy, Saint Petersburg State University, Saint Petersburg, Russia
4. Institute of Endocrinology, Almazov National Medical Research Centre, Saint Petersburg, Russia
5. Laboratory Department, Republican Research Centre for Radiation Medicine and Human Ecology, Gomel, Belarus