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Peer review Peer review information Nature Medicine thanks John Wilding and the other, anonymous, reviewer(s) for their contribution to the peer review of this work

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These commenters stated that CPT 0893T involves exhaled gas analysis of oxygen, carbon dioxide, non-invasive blood oxygenation (PO2) and A-a gradient calculations and state that this procedure is comparable to CPT 94681 (oxygen uptake with exhaled gas analysis including carbon dioxide to assess lung function)