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Valsalva Maneuver: How to Do It and When to Use It - WebMD
Valsalva maneuver - Wikipedia
Valsalva Maneuvers: What They Are and How to Do Them
Valsalva Maneuver: Definition, How-To, Uses, Warnings, and More
Valsalva maneuver: How to do it, uses, and warnings - Medical …
How the Valsalva Maneuver Works - Verywell Health
话说那“神秘的Valsalva动作” - 知乎专栏
Valsalva Maneuver - StatPearls - NCBI Bookshelf
Valsalva Maneuver: What It Is and How to Do It - Healthgrades
Valsalva Maneuver: How to Do It and Whether You Should - Health