Correction

Following publication of the original article [1], the authors notified us of a misleading data presentation in Table 4. The table’s sub header incorrectly presented the information in the first part of the table, BINARY DATA. We have therefore modified this sub header and added a second sub header to the table, corresponding to CONTINUOUS DATA.

The original publication has been corrected. Table 4 as initially published is presented below.

Table 4 Individual trial estimates not combined in meta-analyses