**Author details**

Darmadi Darmadi1 \* and Riska Habriel Ruslie2

1 Faculty of Medicine, Department of Internal Medicine, Universitas Sumatera Utara, Medan, Indonesia

2 Faculty of Medicine, Department of Child Health, Universitas Prima Indonesia, Medan, Indonesia

\*Address all correspondence to: darmadi@usu.ac.id

© 2022 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.
