While you can always invest in a retractable awning to shade your outdoor space, a basic patio umbrella is more reasonably priced and gets the job done without the lengthy installation process.

aDepartment of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, Shenyang, China bDepartment of Clinical Epidemiology, Shengjing Hospital of China Medical University, Shenyang ...