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Background The association between birth position and obstetric anal sphincter injury (OASIS) in spontaneous vaginal deliveries is unclear. Methods The study was based on the Stockholm-Gotland Obstetric Database (Sweden) from Jan 1st 2008 to Oct 22nd 2014 and included 113 279 singleton spontaneous vaginal births with no episiotomy. We studied risk of OASIS with respect to the following birth positions:...
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