1. Department of Infectious Diseases, Danylo Halytsky Lviv National Medical University, Lviv, Ukraine.
2. Lviv Oblast Clinical Hospital of Infectious Diseases, Lviv, Ukraine.
3. St. Panteleimon Hospital of the First Territorial Medical Association, Lviv, Ukraine.
4. State Institution Lviv Oblast Center for Disease Control and Prevention of the Ministry of Health of Ukraine, Lviv, Ukraine.