Akyol, Fethi Ultrasound-Guided Bilateral Greater Occipital Nerve Block for the Treatment of Postdural Puncture Headache. [electronic resource] - Turkish journal of anaesthesiology and reanimation Feb 2014 - 40-2 p. digital Publication Type: Case Reports; Journal Article ISSN: 2667-677X Standard No.: 10.5152/TJAR.2013.59 doi