2008/9/8 · A comparative study of the analysis of human urine headspace using gas chromatography–mass spectrometry S Smith 1, H Burden 2,3, R Persad 3, K Whittington 2, B de Lacy Costello 1, N M Ratcliffe 1 and C S Probert 2 Published 1 September 2008 • , ,