“…The overall quality of guidelines varied, but most of the methodological quality of guidelines was admissible. The overall quality was more than 50% in nine included guidelines [ 7 , 17 , 18 , 19 , 22 , 23 , 24 , 25 , 26 ], especially in five [ 7 , 19 , 23 , 24 , 25 ] which scored 100%. Two guidelines relied on the GRADE approach [ 19 , 27 ], which is the highest quality standard.…”