%0 Journal Article %A R J Grand %A R K Montgomery %A D K Chitkara %A J N Hirschhorn %T Changing genes; losing lactase %D 2003 %R 10.1136/gut.52.5.617 %J Gut %P 617-619 %V 52 %N 5 %U https://gut.bmj.com/content/gutjnl/52/5/617.1.full.pdf