1. Dr Kara B Markham, MD, Richard W O'Shaughnessy, MD
Placental vasa previa 
Dr Kara B Markham, MD, Richard W O'Shaughnessy, MD 
The Lancet 
Volume 377, Issue 9771, (March 2011)
DOI: /S (10)
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2. Figure Placental vasa previa
(A) Doppler ultrasonography showing fetal blood vessels coursing over the internal cervical os; and (B) placenta showing fetal blood vessels within the ammotic membrane, consistent with the diagnosis of a velamentous cord insertion site.
The Lancet  , DOI: ( /S (10) )
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