%0 Journal Article %A Margaret Turner-Warwick %T Precapillary Systemic-pulmonary Anastomoses %D 1963 %R 10.1136/thx.18.3.225 %J Thorax %P 225-237 %V 18 %N 3 %U https://thorax.bmj.com/content/thoraxjnl/18/3/225.full.pdf