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Higgins, Julian P. T.; López-López, José A.; Becker, Betsy J.; Davies, Sarah R.; Dawson, Sarah; Grimshaw, Jeremy M.; McGuinness, Luke A.; Moore, Theresa H. M.; Rehfuess, Eva A.; Thomas, James; Caldwell, Deborah M. (2019): Synthesising quantitative evidence in systematic reviews of complex health interventions. In: BMJ Global Health, Vol. 4, No. Suppl 1, e000858