1. Service de Biostatistique et Information Médicale, Hôpital Saint-Louis, Paris, France;
2. INSERM U1153, Statistic and Epidemiologic Research Center Sorbonne Paris Cité (CRESS), ECSTRRA Team, Université de Paris, France;
3. National Institute of Science and Technology for Health Technology Assessment (INCT/IATS), Clinical Research Center, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Brazil;
4. Department of Neurosurgery, Larbiboisière Hospital, Paris, France