Ruminococcus gnavus, an unusual cause of surgical site infection following vertebral posterior instrumentation: a case report

María C. Solans-Lopez, Mar Sanchez-Somolinos, Cristina Igualada-Blazquez, Tania Quevedo-Narciso, Edmundo Vicente-Herrera, Oscar Riquelme-García, Luis Esparragoza-Cabrera