Fig. 1

Flow chart of reporting guidelines identified, included and excluded. A total of 4329 records were hit by searching electronic databases. After 1387 duplicates removed, 2942 records were screened trough titles and abstracts, and 2877 were excluded. Then 65 full text articles assessed for eligibility, in which 37 were excluded. At last, together with 32 additional reporting guidelines from EQUATOR, 60 reporting guidelines were included