1. Prevention of postdural puncture headache after accidental dural puncture: a quantitative systematic review 
C.C. Apfel, A Saxena, O.S. Cakmakkaya, R Gaiser, E George, O Radke 
British Journal of Anaesthesia 
Volume 105, Issue 3, Pages (September 2010)
DOI: /bja/aeq191
Copyright © 2010 The Author(s) Terms and Conditions

2. Fig 1 (a) PDPH non-RCT for headache; (b) PDPH RCT for headache.
British Journal of Anaesthesia  , DOI: ( /bja/aeq191)
Copyright © 2010 The Author(s) Terms and Conditions

3. Fig 1 (a) PDPH non-RCT for headache; (b) PDPH RCT for headache.
British Journal of Anaesthesia  , DOI: ( /bja/aeq191)
Copyright © 2010 The Author(s) Terms and Conditions

4. Fig 2
PDPH funnel plot of all prophylactic measures versus conservative treatment.
British Journal of Anaesthesia  , DOI: ( /bja/aeq191)
Copyright © 2010 The Author(s) Terms and Conditions