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metabolites of human lung cancer and normal cells in vitro. Cancer Epidemiol Biomarkers Prev 2010,19(1):182–195.PubMedCrossRef 65. Kleinbaum D, Kupper L, Muller A, Nizam K: Applied Regression Analysis and Other Multivariable Methods. Brooks/Cole Publishing Company, Pacific Grove (CA); 1998. Competing interests Authors report no competing interests. Authors’ contribution WF has developed the protocol for TD-GC-MS analyses of volatile compounds in headspace of cell cultures, including: conditions of sample collection, thermal desorption, GC temperature program, and mass spectrometry settings (SIM mode). Additionally, WF performed the gas chromatographic analysis of all samples, performed the calibrations, and wrote a draft of the manuscript.