Study protocol for investigating the clinical performance of an automated blood test for glial fibrillary acidic protein and ubiquitin carboxy-terminal hydrolase L1 blood concentrations in elderly patients with mild traumatic BRAIN Injury and reference values (BRAINI-2 Elderly European study): a prospective multicentre observational study. - Lagares A; Payen JF; Biberthaler P; Poca MA; Méjan O; Pavlov V; Viglino D; Sapin V; Lassaletta A; de la Cruz J (BMJ Open, 2023)