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In response to "search is failing me. someone (pmb?) posted here yesterday about a simple test - holding your breath for 10 seonds - to show your lung health. anyone " by prayformojo

See this -- (link)

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yah, it's not from stanford. I saw it earlier, stopped at the fibrosis check because I know that's not true; and googled. nm but: -- (link)
b. (aka starrynit) Mar 11 '20, 15:59
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