| http://www.w3.org/ns/prov#value | - The system of claim 17, wherein said calorimeter housing includes a mouthpiece configured for a user to breathe into and out of a vent to a source/sink; of respiratory gases and a chamber in fluid communication with said mouthpiece and source/sink; said housing further including a flow tube disposed in said chamber, in a concentric relationship therewith, said flow tube being disposed so that at l
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