%0 Journal Article %A Leszek Pstras %T Valsalva manoeuvre using a syringe: physics and implications %D 2016 %R 10.1136/emermed-2016-206318 %J Emergency Medicine Journal %P 831-831 %V 33 %N 11 %U https://emj.bmj.com/content/emermed/33/11/831.full.pdf