MethodsĀ 
A systematic review was performed using a standardized methodology searching on electronic databases (PubMed, LiLacs, Central Cochrane and Scielo) with relevant literature published until January 2020. Used keywords were: protocol, consensus, score, clinical guidelines, triage, scale, scoring, algorithm, health indicators, tracheostomy. No language restrictions were imposed. There was also a manual search of the references in the selected articles.
We followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines to perform this review.(20)
Criteria to consider studies :