Guidelines characteristics
A total of 367 kinds of literature were searched from databases and guideline websites including six Chinese version guidelines. After duplicate checking, 312 literatures were screened and nineteen guidelines were finally included. PRISMA flow diagram was shown in Figure 1. Of the included guidelines, seventeen were in English and two were in Chinese. Thirteen were CPGs and six were expert consensus-based guidelines, all of which were intended for children. The basic characteristics of the included guidelines are shown in Table 1.21-40