1. Böttcher K, Siewert JR, Roder JD, Busch R, Hermanek P, Meyer H-J (1994) Risk of surgical therapy of stomach cancer in Germany. Results of the German 1992 Stomach Cancer Study. Stomach Cancer Study Group (′92). Chirurg 65(4): 298–306.
2. Feussner H, Siewert JR (1996) Telemedizin — technische Möglichkeiten und sinnvolle Anwendung. Chirurg 10: 984–988.
3. Hermanek P Jr, Wiebelt H, Riedl S, Staimmer D, Hermanek P (1994) Long-term results of surgical therapy of colon cancer. Results of the Colorectal Cancer Study Group. Chirurg 65(4): 287–297.
4. Hempel K, Siewert JR (1996) „Second Opinion“ — Versuch einer Begriffsbestimmung. Chirurg 67(4): 293–296.
5. McSherry CK, Chen PJ, Worner TM, Kupferstein N, McCharthy EG (1997) Second surgical opinion programs: dead or alive? J Am Coll Surg 185(5): 451–456.