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. 2019 Aug 6;12:619–627. doi: 10.2147/PRBM.S199762

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© 2019 Teeravisutkul et al.

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Participants were asked to slowdown their breathing rhythm to a particular rate by inhaling until the wave reached the highest mark on the device and exhale slowly while counting from 1 to 5 and watching for a triangle to appear above the wave, and start to inhale again as the next wave began to rise.