**Author details**

Alfredo Quintin Y. Pontejos Jr. \* and Daryl Anne A. del Mundo Department of Otorhinolaryngology, University of the Philippines Manila-Philippine General Hospital, Manila, Philippines

\*Address all correspondence to: docpontejosjr@yahoo.com

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
