Data collection and extraction
A data abstraction form was designed a priori with Excel
(Microsoft Corp, Redmond Washington, USA) to standardise data
collection. Two independent reviewers (E.B and T.P) scanned all
abstracts identified by search cross-referencing. The full text was then
identified for each study that potentially met the inclusion criteria.
Two reviewers (E.B and T.P) independently reviewed the full-text
eligibility. If no consensus could be reached by the two reviewers and
after discussion, a third specialist author was consulted and made the
decision (J.S and/or C.D). Articles that did not meet the inclusion
criteria were excluded (Figure 1). Data extraction included general
study information (see details in Table 1 and Supplemental Tables 2 and
3).