Quantitative measurement of male steroid hormones using automated on-line solid phase extraction-liquid chromatography-tandem mass spectrometry and comparison with radioimmunoassayElectronic supplementary information (ESI) available: Four tables showing: on-line SPE recoveries of target analytes; matrix effects on recoveries; and intra- and inter-day precision and accuracy of target analytes in cell culture medium by LC-MS-MS. See http://www.rsc.org/suppdata/an/b2/b210111b/