RT Journal Article SR Electronic T1 Stitching and switching: the impact of discontinuous lung function reference equations JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1256 OP 1257 DO 10.1183/09031936.00173011 VO 39 IS 5 A1 Jane Kirkby A1 Paul Aurora A1 Helen Spencer A1 Stephanie Rees A1 Samantha Sonnappa A1 Janet Stocks YR 2012 UL http://erj.ersjournals.com/content/39/5/1256.abstract AB