**Author details**

Aigoul Zinnatullina\* and Rustem Khamitov Kazan State Medical University, Kazan, Russian Federation

\*Address all correspondence to: aigoul-zinnatullina.rust@mail.ru

© 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.

*The Risk Factors of Frequent Exacerbations of COPD DOI: http://dx.doi.org/10.5772/intechopen.107969*
