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Gupta A, Jansson B, Chatelain P, Massingham R, Hammarlund-Udenaes M.Gupta A, et al.Rapid Commun Mass Spectrom. 2005;19(12):1749-57. doi: 10.1002/rcm.1983.Rapid Commun Mass Spectrom. 2005.PMID: 15912525