NEFL and aspiration pneumonitis: After accounting for the cause of death, patients who died because of severe neurological complications (n = 5) had significantly higher levels of β-syn (p = 0.027) and NfL (p = 0.019) compared to all other patients (n = 25), but not compared only to patients who died because of aspiration pneumonia (n = 5) (Supplementary Fig. 2).