Arbildo-Vega, H.; Cantu-Oliva, J.; Chumpitaz-Durand, R.; Agüero-Alva, J.; Rendón-Alvarado, A.; Vásquez-Rodrigo, H. Survival Rate of Fixed Space Maintainers Used in Dentistry. Systematic Review and Meta-Analysis. JOR 2021, 10, 1-10.