1. Central City Clinical Hospital No. 12, Almaty, Kazakhstan.
2. Kazakh Medical University of Continuing Education, Almaty, Kazakhstan.
3. Institute of Surgery named after A.V. Vishnevsky, Moscow, Russia.
4. Khoja Akhmet Yassawi International Kazakh-Turkish University, Shymkent Medical Institute Postgraduate Studies Faculty, Shymkent, Kazakhstan.
5. S.D. Asfendiyarov Kazakh National Medical University, Almaty, Kazakhstan.