1. A randomized prospective study comparing two flexible epidural catheters for labour analgesia†  
J.E. Spiegel, A. Vasudevan, Y. Li, P.E. Hess 
British Journal of Anaesthesia 
Volume 103, Issue 3, Pages (September 2009)
DOI: /bja/aep174
Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

2. Fig 1
Flow-diagram. The single-holed, open-ended catheter group is on the right, and the three-holed group on the left. Immediate complete analgesia (at 30 min) and overall analgesia success for labour (through second stage) are primary endpoints.
British Journal of Anaesthesia  , DOI: ( /bja/aep174)
Copyright © 2009 British Journal of Anaesthesia Terms and Conditions