1. Volume 17, Issue 7, Pages 609-617 (July 2018)
Prevalence of patent foramen ovale in cryptogenic transient ischaemic attack and non- disabling stroke at older ages: a population-based study, systematic review, and meta- analysis 
Sara Mazzucco, MD, Linxin Li, DPhil, Lucy Binney, MD, Prof Peter M Rothwell, FMedSci 
The Lancet Neurology 
Volume 17, Issue 7, Pages (July 2018)
DOI: /S (18)
Copyright © 2018 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 license Terms and Conditions

2. Figure 1
Prevalence of PFO in patients with cryptogenic events compared with patients with events of known cause
Meta-analyses of the prevalence of PFO in patients with cryptogenic events compared with patients with events of known cause, stratified by imaging modalities, (A) overall and (B) in older patients, according to study author's definition. PFO=patent foramen ovale. OR=odds ratio. Bubble-TCD=contrast-enhanced transcranial Doppler. OXVASC=Oxford Vascular Study. *Age cutoff points for the older group in different studies ranged between 40 and 60 years.
The Lancet Neurology  , DOI: ( /S (18) )
Copyright © 2018 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 license Terms and Conditions

3. Figure 2
Meta-analyses of the prevalence of PFO stratified by screening modality
PFO=patent foramen ovale. Bubble-TCD=contrast-enhanced transcranial Doppler. OXVASC=Oxford Vascular Study.
The Lancet Neurology  , DOI: ( /S (18) )
Copyright © 2018 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 license Terms and Conditions