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Nevitt, Sarah J 
ORCID: 0000-0001-9988-2709, Marson, Anthony G ORCID: 0000-0002-6861-8806, Davie, Becky, Reynolds, Sally, Williams, Lisa and Smith, Catrin Tudur
(2017)
Exploring changes over time and characteristics associated with data retrieval across individual participant data meta-analyses: systematic review.
BMJ-BRITISH MEDICAL JOURNAL, 357.