Endoscopy, Table of Contents Endoscopy 2014; 46(08): 716DOI: 10.1055/s-0034-1377422 Letters to the editor © Georg Thieme Verlag KG Stuttgart · New York Reply to Isayama et al. Meike Hirdes , Mathias Peirlinck , Matthieu De Beule , Peter D. Siersema Recommend Article Abstract Buy Article Full Text References References 1 Hirdes MM, Vleggaar FP, de Beule M et al. In vitro evaluation of the radial and axial force of self-expanding esophageal stents. Endoscopy 2013; 45: 997-1005 2 Isayama H, Nakai Y, Toyokawa Y et al. Measurement of radial and axial forces of biliary self-expandable metallic stents. Gastrointest Endosc 2009; 70: 37-44