Oncovascular Surgery is Effective in the Treatment of Retroperitoneal Tumors Involving Major Blood Vessels; A Single Centre Retrospective Cohort Study. (December 2019) - Homsy, Pauliina; Heiskanen, Ilkka; Tukiainen, Erkki; Numminen, Kirsti; Blomqvist, Carl; Böhling, Tom; Kantonen, Ilkka; Vikatmaa, Pirkka