Standardized Outcomes for Randomized Controlled Trials Targeting Early Interventions in Patients With Moderate-to-Severe Traumatic Brain Injury: Protocol for the Development of a Core Outcome Set - Raphael Cinotti; Yvan Derouin; Amandine Chenet; Lydia Oujamaa; Bertrand Glize; Yoann Launey; Claire Dahyot-Fizelier; Emmanuelle Cartron; Melodie Renvoise; Benedicte Sautenet; Veronique Sebille (JMIR Research Protocols)