T. Kirchner

Endoscopic sinus surgery training courses: benefit and problems - a multicentre evaluation to systematically improve surgical training.

A. Leunig, G. Strauß, K. Stelter, 2012, Rhinology.

The German Registry for Natural Orifice Translumenal Endoscopic Surgery: Report of the First 551 Patients

Michael Butters, Andreas Wibmer, Christoph Holmer, 2010, Annals of surgery.

Endoscopic sinus surgery training courses: benefit and problems - a multicentre evaluation to systematically improve surgical training.

A. Leunig, G. Strauß, K. Stelter, 2012, Rhinology.