Johnson JJ, Loeffert AC, Stokes J, Olympia RP, Bramley H, Hicks SD. Association of Salivary MicroRNA Changes With Prolonged Concussion Symptoms. JAMA Pediatr. 2018;172(1):65–73. doi:10.1001/jamapediatrics.2017.3884
In this prospective cohort study of 52 children with mild traumatic brain injury, concentrations of 5 salivary microRNAs identified prolonged concussion symptoms with 85% accuracy and outperformed standard survey measures of symptom burden.