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breathing × 59lungs × 9
air-quality × 8
respiratory-system × 7
oxygenation × 7
sleep × 6
exercise × 6
cpr × 4
pulmonology × 4
cardiology × 3
death × 3
nose × 3
sports × 3
hypoxia × 3
covid-19 × 2
terminology × 2
brain × 2
allergy × 2
lasting-effects-duration × 2
effectiveness × 2
position × 2
technology × 2
birth × 2
oxygen × 2
inhalation × 2