%0 Journal Article %A M P Tighe %A M Cullen %A R M Beattie %T How to use: a pH study %D 2009 %R 10.1136/adc.2008.145169 %J Archives of disease in childhood - Education & practice edition %P 18-23 %V 94 %N 1 %U https://ep.bmj.com/content/edpract/94/1/18.full.pdf