**Author details**

Samuel Osei-Nketiah\* and William Appeadu-Mensah Department of Surgery, University of Ghana School of Medicine and Dentistry, Accra, Ghana

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

© 2019 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.
