1. Students’ Scientific Circle of Neurosurgery, Neurosurgery Department, Medical University of Gdansk , Gdansk 80-952 ,
2. Neurosurgery Department, Medical University of Gdansk , Gdansk 80-952 ,
3. Department of Neurosurgery, Provincial Specialist Hospital in Słupsk , Hubalczyków 1, Słupsk 76-200 ,