**Introduction**

a few interesting videos on wideband tympanometry, and the web references are included

I would personally like to thank all the contributing authors, the InTech personnel, and spe‐ cifically Ms. Ana Simcic for her continuous and generous assistance during the preparation

> **Stavros Hatzopoulos, PhD** Clinic of Audiology and ENT, University of Ferrara, Italy

in the Appendix section of the relative chapter.

**Acknowledgments**

of the volume.

VIII Preface
