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. 1999 Dec 18;319(7225):1612–1613. doi: 10.1136/bmj.319.7225.1612

Figure 1.

Figure 1

Circular breathing. Intake of breath fills the chest and stomach; cheeks and neck are inflated when air is halfway up the chest. While forcing air from cheeks and neck into the instrument, the player simultaneously breathes in through the nose to the bottom of the stomach