Sluggish gas exchange in the lungs may be involved in long-COVID brain fog cidrap.umn.eduCognitive deficits after COVID-19 associated with brain injury biomarkers and volume loss Nature.comLong COVID Brain Fog Linked to Lung Function PR NewswireNew research shows younger and middle-aged adults have worse long COVID symptoms than older adults Northwestern Medicine NewsroomLong COVID ‘brain fog’ linked to lung dysfunction in new study Henry Herald