**Jihye Kim, Jang Hyun Kim and Tae-Hwan Kim**

Changes in Sleep Problems in Patients Who Underwent Surgical Treatment for Degenerative Spinal Disease with a Concurrent Sleep Disorder: A Nationwide Cohort Study in 3183 Patients during a Two-Year Perioperative Period

Reprinted from: *Journal of Clinical Medicine* **2022**, *11*, 7402, doi:10.3390/jcm11247402 ........ **207**
