Fig. 3
From: The score after 10 years of registration of systematic review protocols
Topics of all included SRs. Topics are classified according to Web of Science (WoS) categories. No category was assigned to 17 included SRs that were not indexed to a WoS category. The figure represents the total sample of SRs (N = 357). As each SR could have been indexed to multiple topics, the total number exceeds the number of SRs