“…Our search strategy identified 21 articles among the PubMed database. After screening using the phrases: singing voice handicap index (SVHI), adults and normal voices, and professional voice users, eight studies were identified 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 and therefore included. In Table 2 e characteristics of the studies are summarized.…”