**Author details**

Ljubica Caldovic Children's National Medical Center, Center for Genetic Medicine Research, The George Washington University, Institute for Biomedical Sciences, Washington, DC, USA

\*Address all correspondence to: lcaldovic@childrensnational.org

© 2018 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.
