1. Obstetrical Anal Sphincter Injuries (OASIS): Prevention, Recognition, and Repair 
Marie-Andrée Harvey, MD, MSc 
Journal of Obstetrics and Gynaecology Canada  
Volume 37, Issue 12, Pages (December 2015)
DOI: /S (16)
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2. Figure 1 Urogenital musculature
Journal of Obstetrics and Gynaecology Canada   , DOI: ( /S (16) )
Copyright © 2015 Society of Obstetricians and Gynaecologists of Canada Terms and Conditions

3. Figure 2 Episiotomy sites
Journal of Obstetrics and Gynaecology Canada   , DOI: ( /S (16) )
Copyright © 2015 Society of Obstetricians and Gynaecologists of Canada Terms and Conditions