1. Doctor-Stomatologist-Surgeon (DSS), Center of Maxillofacial Surgery and Dentistry, Kyiv Regional Clinical Hospital, Kyiv, Ukraine.
2. Doctor of Ultrasound Diagnostics (DUD), Head, Department of Ultrasound, Regional Diagnostic Center, Polyclinic, Kyiv Regional Clinical Hospital, Kyiv, Ukraine. cherniak.os@gmail.com