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Nevitt, SJ 
ORCID: 0000-0001-9988-2709, Marson, AG ORCID: 0000-0002-6861-8806, Davie, B, Reynolds, S, Williams, L and Tudur Smith, C ORCID: 0000-0003-3051-1445
(2017)
Exploring changes over time and characteristics associated with data retrieval across individual participant data meta-analyses: systematic review.
BMJ: British Medical Journal, 357 (8101).
j1390-.